Metrowerks for Mac may be nostalgia. Metrowerks for PalmOS was like trying to breed a duck with a platypus. I mean, they're both using Motorola 68K, so it should work...
I was the tech lead on CodeWarrior for Palm OS v7, v8, and v9... it was quite a mishmash, and the Windows version was a really big hack on a hack. I ended up rewriting the whole 68K toolchain and linker for the v9 version, but that ended up making something that we couldn't economically justify porting back to Mac OS (it was 2003, Macs weren't doing so well).
Since the Palm had a very screwy approach to memory in general, your team did a fine job.
The PalmOS API was heavily inspired by classic Mac OS. The similarities are striking -- a lot of the system traps even had the same names across both platforms.
I still have all my Sony Magic Cap [1] stuff which came out around CodeWarrior 6 I think. Some type of Metrowerks MPW environment and a software emulator which crashed if you breathed on it!