[HD Mini Android Development] iPlasm:
yes, you can use a text editor by copy paste the line and add to bottom of line of build.prop and it's located in root "/system/", :D

this is full of build.prop with that new tweak:

# begin build properties
# autogenerated by buildinfo.sh
ro.build.id=IMM76L
ro.build.display.id=Phonerty CyanogenMod9.1
ro.build.version.incremental=eng.phonerty
ro.build.version.sdk=15
ro.build.version.codename=REL
ro.build.version.release=4.0.4
ro.build.date=Fri Nov 9 00:00:00 GMT 2012
ro.build.date.utc=1352100235
ro.build.type=userdebug
ro.build.user=iPlasm
ro.build.host=Phonerty
ro.build.tags=test-keys
ro.product.model=Photon
ro.product.brand=HTC
ro.product.name=cm_liberty
ro.product.device=liberty
ro.product.board=liberty
ro.product.cpu.abi=armeabi-v6l
ro.product.cpu.abi2=armeabi
ro.product.manufacturer=HTC
ro.product.locale.language=en
ro.product.locale.region=GB
ro.wifi.channels=
ro.board.platform=msm7x27
# ro.build.product is obsolete; use ro.product.device
ro.build.product=liberty
# Do not try to parse ro.build.description or .fingerprint
ro.build.description=cm_liberty-userdebug 4.0.4 IMM76L eng.iPlasm.20121109.000000 test-keys
ro.build.fingerprint=htc/cm_liberty/liberty:4.0.4/IMM76L/eng.iPlasm.20121109.000000:userdebug/test-keys
ro.build.characteristics=default
ro.cm.device=liberty
# end build properties

#
# ADDITIONAL_BUILD_PROPERTIES
#
ro.rommanager.developerid=cyanogenmod
keyguard.no_require_sim=true
ro.url.legal=http://www.google.com/intl/%s/mobile/android/basic/phone-legal.html
ro.url.legal.android_privacy=http://www.google.com/intl/%s/mobile/android/basic/privacy.html
ro.com.google.clientidbase=android-google
ro.com.android.wifi-watchlist=GoogleGuest
ro.setupwizard.enterprise_mode=1
ro.com.android.dateformat=dd-MM-yyyy
ro.com.android.dataroaming=false
ro.cm.version=9.1.0-Unofficial-Photon
ro.modversion=9.1.0-Unofficial-Photon
ro.config.ringtone=MidEvilJaunt.ogg
ro.config.notification_sound=Procyon.ogg
ro.config.alarm_alert=Noises1.ogg
rild.libpath=/system/lib/libhtc_ril_wrapper.so
rild.libargs=-d /dev/smd0 nand_init
ro.ril.enable.dtm=1
ro.ril.hsdpa.category=8
ro.ril.hsupa.category=5
ro.ril.disable.fd.plmn.prefix=23402,23410,23411
ro.ril.def.agps.mode=1
ro.ril.hsxpa=2
ro.ril.gprsclass=12
mobiledata.interfaces=rmnet0,rmnet1,rmnet2,gprs,ppp0
wifi.interface=wlan0
wifi.supplicant_scan_interval=15
ro.sf.lcd_density=160
ro.opengles.version=131072
ro.telephony.ril.v3=signalstrength
ro.telephony.default_network=0
ro.phone_storage=0
dalvik.vm.heapsize=32m
settings.display.autobacklight=1
settings.display.brightness=143
persist.service.mount.playsnd=0
ro.com.google.locationfeatures=1
ro.setupwizard.mode=OPTIONAL
ro.setupwizard.enable_bypass=1
ro.media.dec.aud.wma.enabled=1
ro.media.dec.vid.wmv.enabled=1
dalvik.vm.dexopt-flags=m=y
ro.config.sync=yes
persist.sys.usb.config=mass_storage,adb
dalvik.vm.dexopt-data-only=1
debug.sf.hw=1
debug.qctwa.statusbar=1
debug.qctwa.preservebuf=1
com.qc.hardware=true
com.qc.hdmi_out=false
debug.camcorder.disablemeta=1
ro.vold.umsdirtyratio=20
media.a1026.nsForVoiceRec=0
media.a1026.enableA1026=1
dalvik.vm.lockprof.threshold=500
net.bt.name=HTC HD Mini
[COLOR="Red"][B]ro.HOME_APP_ADJ=1[/B][/COLOR]
dalvik.vm.stack-trace-file=/data/anr/traces.txt