I can't find outplace (at least not in 1.0.4 or 'latest' on the Nim playground). However, I'll have another go with shuffle which I already use elsewhere.
I'm sure there are other Nim libs that support NiGui's missing features -- but don't all of them depend on SDL or OpenGL or other third party libs? As for github, I have an a/c there to contribute, but I don't put my own projects there. My gravitate packages include the full source.