They indeed show the great graphic-power of today's phones but - sadly - lack playability due to their touchscreen controls. (An exception is the version for Nokia's N95 with d-pad/accelerometer controls, which works very well. But that phone is pretty outdated of course.)
I found a mod called "gotwalls" which includes an aim-assistant. Think it was meant for cheating, but nevertheless works very well - at least for desktop-Q3 - and comes with lots of adjustable parameters: http://www.gotwalls.com/files.html (READ ME: http://www.gotwalls.com/files/readme-beta4.txt) Unfortunately it's only for version 1.17. Tried all I could (which still isn't very much) to make it compatible with 1.32 and ioQuake (on which the mobile versions are based), but failed. - Can someone help?
I guess the best thing you could do is to check out the sourcecode of ioQuake and port over the changes made in those files to that code base and recompile the cgame files.
What might help is to get the 1.17 source code from id software's FTP server and run a diff compare between the relevant files to see what changes were made. Maybe the changes aren't very complex and you can copy/paste them over to the 1.32/ioQuake code base by hand.