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I want this to be able to work for as many users as possible, not sure if it
works for the touch screen mp5 (I hope so).
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Whats the difference and why do you have concerns that it may not work for touchscreen players? Whats your approach to patching and what is getting patched? I think it would be a bad idea to assume absolute offsets since those may change even for different firmware versions of the same player. One approach to identify certain subroutines would be to calculate (crc32) signatures (independent of abs. values that may change like addresses of subroutines or variables) for these. You may need some kind of "intelligent disassembler" that identifies subroutines and can trace hardware register i/o. Here is a small article on APCS (ARM Procedure Calling Std.):
APCS introduction.
Good luck