I assume you mean a utility that allows you to edit the game file to give you more gold or infinite resources or whatever?
The answer is no, not for the Mac. You could try running something like that in Windows using Parallels or VMWare Fusion on an Intel Mac, or Virtual PC on your PowerPC, I guess, but the effort required seems to me to be disproportionate.
The game has several levels of difficulty starting at Warlord, and it's pretty easy to beat the AI at Warlord level. Using a "trainer" to give yourself even more advantages seems unnecessary to me.