[Q] adding applications to custom rom questions
in I have 3 questions about apps on custom roms
1: in some topics i read that people tried to put them in data/app or system/app . I guess system apps are not removable (or are partialy protected against uninstall). Or I am totaly wrong ... So what is the difference, where should i put the apps i wish to install ???
2: for some funny reason, some apps are installed, some not and some are visible but doesn't work .... What should i do to be sure that each app will work ??? should i first Zipalign or Deodex them ???
3: some apps require some configuration (for example i would like to add setcpu with profiling enabled to set the cpu at minimum when the display is off)
but how can i set this configuration in THE ROM so that i don't need to do it once the rom is installed ???