How about using kkrunchy -> http://www.farbrausch.de/~fg/kkrunchy/
instead of UPX? It gives smaller exes than upx (for instance it compressed my screensaver, in .exe form from 137k uncompressed to 32k instead of UPX's 58k), and is generally better (was used by authors of kkrieger)
darkhog wrote:And how about bundling kkrunchy along with ZGE?
ZGameEditor used to have kkrunchy bundled with it, but too many people were getting false positives from the executable .. so it was taken out of the release distribution.