My wish would be to have have Make Map save the map file into the terrain\texsrc folder of the terrain folder it was run from, with the correct terrain name? instead of saving it to the general terrain folder as 'map'.bmp.
It would be even greater if you could force terrain editor to load the updated one that you just generated without having to exit and reopen the app but that's probably a second wish right there.
It probably doesn't seem significant but it would eliminate some file copying and renaming which can get tedious if you keep building your cbm to navigate over newly created landmasses and stuff.