It's fine by me, go ahead-ViciouZ is a pretty cool guy I'm sure he won't care. It's the principle of it though.
Let's say instead of DPMapRelease it was another program, say.. the Digital Paint 2 engine.
Sure you have the source-Jitspoe releases it, and Jitspoe has a laundry listof features to add, so why not just add a few lines of code, and release it on the forum as DP2-eiii.zip?
I'm betting Jitspoe wouldn't be real happy with it.
The same goes for all software, it's not that you shouldn't modify the original developers stuff without the proper license or expressed consent, but you shouldn't release it. Especially on the same platform it was originally released on. It can quickly cause shards, which kill projects.