I just completed the Eternal Damnation mod last night and I had a blast playing through it, (although I will say that I got lost quite a bit during the game) and since ED will be brought onto Steam Workshop at some point I've thought of a cameo they could have in the mod:
What if the lunatic who kills everyone in Happy Hill at the start of the game is actually the Postal Dude from the original Postal?
As a little Easter Egg they could have the Dude as the lunatic instead of the guy with the red spiked-up hair, and the Dude could perhaps escape from the asylum sometime after you do as a throwback to the first Postal game. (Perhaps his escape could be reported on the news as part of the Easter Egg?)
What do you think?