[Android Software/Hacking General [Developers Only]] darkerm:
My Build.prop

##### Merging of the /util/data/semc_kernel_time_stamp.prop file #####
ro.build.date=Tue Apr 24 11:57:09 2012
ro.build.date.utc=1335261429
ro.build.user=BuildUser
ro.build.host=BuildHost

##### Final patch of properties #####
ro.build.product=MT15a
ro.build.description=MT15a-user 4.0.4 4.1.B.0.431 UL5_3w test-keys

ro.product.brand=SEMC
ro.product.name=MT15a_1247-4373
ro.product.device=MT15a
ro.build.tags=release-keys
ro.build.fingerprint=SEMC/MT15a_1247-4373/MT15a:4.0.4/4.1.B.0.431/UL5_3w:user/release-keys

######################## Customized property values #########################

ro.semc.version.cust=1247-4373
ro.semc.version.cust_revision=R2I
ro.semc.enable.fast_dormancy=false
ro.com.google.clientidbase.am=android-telstra-au
ro.com.google.clientidbase.ms=android-telstra-au
ro.config.notification_sound=One_Click.ogg
ro.semc.ecclist.num=1
ro.semc.ecclist.type.0=police
ro.semc.ecclist.number.0=000
ro.semc.ecclist.plmn.0=505 FFF
ro.operator.displayUnicodeName=false
ro.settings.apn.lock=Telstra Internet,Telstra Internet,Telstra MMS
ro.telephony.no_emg_calls_only=false

#########################################################################

ro.config.ringtone=sony_ericsson.ogg
ro.config.alarm_alert=alarm.ogg
ro.semc.content.number=PA9

################# Updating of the SW Version #################
ro.semc.version.fs_revision=4.1.B.0.431
ro.build.id=4.1.B.0.431
ro.build.display.id=4.1.B.0.431

##### Values from product package metadata #####
ro.semc.product.model=MT15a
ro.semc.ms_type_id=AAD-3880101-BV
ro.semc.version.fs=WORLD-1-2-5
ro.semc.product.name=Xperia neo
ro.semc.product.device=MT15
ro.product.model=MT15a

# begin build properties
# autogenerated by buildinfo.sh
ro.build.version.incremental=UL5_3w
ro.build.version.sdk=15
ro.build.version.codename=REL
ro.build.version.release=4.0.4
ro.build.type=user
ro.product.board=
ro.product.cpu.abi=armeabi-v7a
ro.product.cpu.abi2=armeabi
ro.product.manufacturer=Sony Ericsson
ro.product.locale.language=en
ro.product.locale.region=GB
ro.wifi.channels=
ro.board.platform=msm7x30
# ro.build.product is obsolete; use ro.product.device
# Do not try to parse ro.build.description or .fingerprint
ro.build.characteristics=default
# end build properties
#
# system.prop for hallon
#

# Notify the system that the RIL only signals once
ro.telephony.call_ring.multiple=false

rild.libpath=/system/lib/libril-qc-1.so
rild.libargs=-d /dev/smd0
persist.rild.nitz_plmn=
persist.rild.nitz_long_ons_0=
persist.rild.nitz_long_ons_1=
persist.rild.nitz_long_ons_2=
persist.rild.nitz_long_ons_3=
persist.rild.nitz_short_ons_0=
persist.rild.nitz_short_ons_1=
persist.rild.nitz_short_ons_2=
persist.rild.nitz_short_ons_3=
DEVICE_PROVISIONED=1

wifi.interface = wlan0
ro.semc.wifi.hostapd=1

ro.semc.sols.product-code=84
ro.semc.timescape_keys=Sony_Ericsson_Xperia

ro.semc.sols.company-code=5
persist.ro.ril.sms_sync_sending=1
ro.use_data_netmgrd=true

# Disable strict mode checking
persist.android.strictmode=0

# Constant values for Battery test in Service menu
ro.semc.batt.capacity=1500
ro.semc.batt.test.z_threshold=50
ro.semc.batt.test.min_level=70

ro.service.swiqi.supported=true
persist.service.swiqi.enable=1

#Default values/Locales for the hiding languages feature
ro.product.locale.excluded=ar_EG ar_IL fa_IR iw_IL

#
# ADDITIONAL_BUILD_PROPERTIES
#
ro.product-res-path=framework/SemcGenericUxpRes.apk
ro.setupwizard.mode=DISABLED
ro.com.google.gmsversion=4.0_r1
ro.com.google.clientidbase=android-sonyericsson
drm.service.enabled=true
keyguard.no_require_sim=true
ro.com.android.dateformat=MM-dd-yyyy
ro.com.android.dataroaming=false
ro.ril.hsxpa=1
ro.ril.gprsclass=10
ro.semc.xloud.supported=true
dalvik.vm.heapstartsize=5m
dalvik.vm.heapgrowthlimit=48m
dalvik.vm.heapsize=128m
ro.sf.lcd_density=240
ro.usb.pid_suffix=156
dalvik.vm.dexopt-flags=m=y
net.bt.name=Android
dalvik.vm.stack-trace-file=/data/anr/traces.txt
ro.drm.active.num=4
ro.drm.active.0=semc,1
ro.drm.active.1=cmla,0
ro.drm.active.2=viaccess,0
ro.drm.active.3=marlin,1
# SuperCharger Installation Marker.
# V6 SuperCharger, OOM Grouping & Priority Fixes created by zeppelinrox.
# SuperMinFree Calculator & MFK Calculator (for min_free_kbytes) created by zeppelinrox also ;^]
#
# See http://goo.gl/krtf9 - Linux Memory Consumption - Nice article!
# See http://goo.gl/hFdNO - Memory and SuperCharging Overview ...or... "Why `Free RAM` Is NOT Wasted RAM!"
# See http://goo.gl/4w0ba - MFK Calculator Info - explanation for vm.min_free_kbytes.
#
# DO NOT DELETE COMMENTS. DELETING COMMENTS WILL BREAK UNINSTALL ROUTINE!
#
# BEGIN OOM_MEM_Settings
# END OOM_MEM_Settings
# BEGIN OOM_ADJ_Settings
# END OOM_ADJ_Settings
# Miscellaneous Tweaks!
persist.sys.purgeable_assets=1
wifi.supplicant_scan_interval=180
windowsmgr.max_events_per_sec=200
pm.sleep_mode=1
# 3G TurboCharger Enhancment!
net.dns1=8.8.8.8
net.dns2=8.8.4.4
net.tcp.buffersize.default=4096,87380,256960,4096,16384,256960
net.tcp.buffersize.wifi=4096,87380,256960,4096,16384,256960
net.tcp.buffersize.lte=262144,524288,1048576,262144,524288,1048576
net.tcp.buffersize.hsdpa=6144,262144,1048576,6144,262144,1048576
net.tcp.buffersize.evdo_b=6144,262144,1048576,6144,262144,1048576
net.tcp.buffersize.umts=4096,87380,256960,4096,16384,256960
net.tcp.buffersize.hspa=6144,87380,262144,6144,16384,262144
net.tcp.buffersize.gprs=4096,87380,256960,4096,16384,256960
net.tcp.buffersize.edge=4096,87380,256960,4096,16384,256960
# End of V6 SuperCharged Entries.

I can only change "12. Net speed tweaks" because it in my Build.prop.

I want to use

2. Raise JPG quality to 100%

5. Decrease dialing out delay

6. Helps scrolling responsiveness

7. Save battery

9. Increase overall touch responsiveness

10. Raise photo and video recording quality

so what should I do? where can I put those script?

Please help.