So far I'm pretty impressed with scribble.
I'm not sure how well it will work for larger projects with multiple makefiles, but individually it's much better than expected.
Thanks. The project functionality should work fine for more complex makefiles as well but it obviously depends on you having makefiles in the first place :-). For some users it would obviously be good to provide an alternative of fully integrated project management like in IDEs on other platforms but it's not something I have a lot of motivation to do (I wouldn't use it myself basically).
By the way, the big feature for the next version (besided loads of smaller things here and there) will be extensive support for Lua scripts and automatic script recording.