1. Tileset errors:
Yeah, Warboy explained it in more lenth but in short a custom tileset will be supplied to avoid more of that crap.
2. @Robin:
Set the "buy cost" to 0 and make an impossible requirement for Ufopaedia articles, that's all you need to do. It won't break the saves. Alternatively, change the stats of the rocket launcher and all ammo to your ends, that's what I did.
3. @Claireity:
I have no idea what's wrong with Doom creatures, they should work by all accounts... must be dark magics.
However, I am almost absolutely sure Govt Enforcers do not generate a crash, I've catched and interrogated them many times... The engine is a real bitch on capturing live enemies and even making a small omission results in these crashes.