[XPERIA X10 General] mmokk:
At first I will say that at first I wanted to do a quick reply, but as the ideas came to my mind i started thinking about full topic xD

The topic was created to give devs ideas for some smaller tweaks/upgrades/features. I made this topic after I saw that the topic where dev asked what do you want for new rom, peoples only idea was "MIUI". I was little bit disappointed by that.

As I have many ideas I will sort them in groups.

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General use tweaks and functions:

- A player in lock screen (only visible when playing music)

- Changing songs by long press volume button (Old SE function implemented in very old phones ages ago)

- Auto air plane mode on selected by user hours (I mean turning off gsm/3g at night)

- Turning the led for buttons in pre-defined light conditions. (For example: in direct sunlight the buttons are very visible and i don't think that anyone has got problem in finding them. They are wasting battery at that time and no one can even see them. But at night it might be helpful for some users)

- Motion-blured launcher (and if it is possible - other apps also)

- Any wifi signal tweak is great also

- I use default x10 launcher because I love the music widget and timescape. Rest is only a bonus. I really don't like that we don't have feature that our x8 friends has got by default - up/down gesture that enables app drawer and goes back.

- Equalizer in default music app

- Faster wifi connecting (huh I know that we have a really bad wifi controller but any tweak here would be great)

- Using some other keyboard than default one

- Already updated versions of programs on roms (like latests maps instead of older ones - I know that you want to make your roms ultra light weight but it would save some time for users, and we really don't look so much if the file size of our room is 3 or 4 mb bigger)(of course you should make rom as lightweight as possible :))

- Panorama app by default would be ok

- AdBlock (these is also a battery tweak - reduces the number of connections)

- By default power save widget doesn't work, why is it still implemented?

- Making more free ram by disabling setup wizard service (does anyone need it??)

- XDA app should be in ROM by default (with option to remove it of course)

- Increased call volume

- Some audio quality enchantments using headphones

Picture/camera/video related things:

- Improving bitrate/fps of videos and improving pics (but that isn't anything genius I think)

- 16mln colors (but that is also obvious)

- Control of exposure time and ISO [would be soo really great that i would start thinking about donation]

- Something that would look good and be same useful as androids gallery, but would provide normal zoom (I mean full resolution zoom)

- Making photo app start faster

- Auto flash in poor light

- A flash instead of non stop shining (it is also great battery tweak)

- Making RAW (Dreams xD)

- Option to adjust and/or turn off default denoise/sharpen algorithm (sometimes I hate the edges wrrr)

Battery saving:

- As I wrote - turning network at night

- Improving bravia engine to do more - in tv's the back-light is adjusted to the picture it is viewing. If the image that is on our phone is pure black the phone would reduce backlight to minimum. If half of the screen would be gray and the other half also the backlight would be also reduced to minimum but the gray pixels would be shown in the hardware as pure white. For us we would have more battery juice, better blacks and there wouldn't be anything missing from image. It there would be elements that would need 100% white the screen backlight would be also set to 100%. I don't know how hard it is to implement, it could need bootloader unlock but it would be a milestone for our x10, not a simple tweak

- Calibration notification - once 2 months or some pre-defined amount of charging cycles

- Some app that would automatically adjust voltages. It would check every freq with some voltage. If it didn't have restarted it continues making the voltage lower if not it would use higher V

- Enabling lower freq than 128mhz (but not like doomlord's that the voltage was 1000mv and you couldn't change that [Of course it is very good that he proved that it is possible])

- A flash instead of non stop shining (it is also great camera tweak)

- If 3g is enabled in settings, the phone would turn it off if the screen is also off (we don't need 3g when we don't use the phone so lets use edge to save battery and still be able to answer the phone)

- Make media server as individual zip. It uses power (I always have in battery usage that it "ate" about 2% to 5% of battery. Not everybody use it so it might be helpful)

- Adblock - Reduces number of connections (these is also general tweak)

Appearance:

- Making puzzle lock default lock screen

- Making gray battery circle default

- Making colorful/green icons

- Transparent bar of launcher

- Wallpapers specially for our x10 (in few weeks I'll start doing some)

- Replacing the clock on lock screen

- weather on lock screen

Note that Appearance is my own opinion and some people might not like it​

I'm not posting some obvious things like bootloader/better multitouch. Every dev knows the basic things to do.

Ok, I think thats enough for now. If you have ANY ideas for our x10 please comment below so I can add them to our list

I know that some of ideas are already implemented in some roms. But they are extremely rare.

If some devs would like to talk about some ideas, they can do that here also.