Just installed 0.0.15 from extras-testing. Nice app, however I have some concerns:

• Tweakr completely borked the default behaviour of lens cover. Normally lens cover when opened unlocks the device AND starts camera application. After installing Tweakr I get two different behaviours: when tickbox is checked - lens cover only unlocks device but doesn't start a camera; when tickbox is unchecked - opening lens cover while device is locked does nothing, I need to unlock device, and then slide lens to get camera launched. I would rather see an three-way option for lens cover opening: 1) leave default behaviour, 2) unlock only, 3) do nothing.
• Idea of custom profile presets is great, but I'd rather see that as an on/off option, as Tweakr completely takes over Profile applet even when no presets are set (some people might see two default profiles just fine). Also, as General and Silent profiles are hard-coded in the system anyway, it might be good idea to hard-code them to Tweakr too in order to avoid confusion between system profiles and custom presets (I've seen that suggestion somewhere earlier in this thread).
• Personally, I think custom profiles/presets would quickly become out of scope of Tweakr app itself, I'd suggest creating separate app just for that with potential for further feature expansion (I see people already making a lot suggestions), leaving Tweakr solely for... tweaks. :)

I like this app. It has few rough edges but I believe it has excellent potential and I'm looking forward to see it developing. Good work!