1. no, has not been used since 2.2 came out. droidswap the app was never updated to work on 2.2. 2. they mount system so if u use terminal emulator u can edit the apps in /system/app 3. they try to keep the specified amount of mb's free all the time, not exact but try to stay close. i recommend using either 50 mb or 75 mb at most. it will auto kill things but task killers are still good to have incase the system cant get apps to end. if you have any more questions please feel free to keep asking bc the more you know the more you can enjoy ud roms!