@Robert Wiggins: Actually RC is a great comparison, I haven't tried RC planes myself but it indeed seems pretty much the same.

Thanks for the suggestion, 4L0M. I've tried a free tool like that, but I didn't get it to work and gave up after some time (I'll pm you about the tools you use).

What I failed to mention before was that another "popular" ww1 flight sim offers most of the things on my wishlist. It can't be compared to woff really, but the in-game modifying of input curves I do miss.