Thanks million, @blackheart612, I love this mod, it makes my KSP complete
A few findings with the 3.0 version for KSP 1.1:
In the VAB, after right clicking a Kerbodyne part, the context menu is broken (opens an infinite amount of menus, saying "New text here")
When staging the interstage fairing, it explodes (seems like the decouple force is way too high, maybe?)
Sometimes (or even, often) the engines do not apply any thrust, even though they consume LFO
Sometimes I can't steer the craft, even though anything else seems to work (maybe same problem as above, cannot apply any force at all?)
I don't have time to test any further now (it's 1 o'clock in the morning here, RL calls), but I hope it helps
Cheers!