Just a thought about the editor:

when browsing around in the viewport i think it's weird that when you scroll downwards with the middle of the viewport straight down you don't move straight up. i think i've experienced a similar problem once when i forgot to convert my rotation to radians(i can't remember what to convert to.. degtorad i think it was) before rotating the viewport :idea: i don't know if you have heard for this before though

Jeppe