Hey lectronice! Looking forward to seeing more of Nékromegà. :)
It's good timing that you are asking about these features, because I am planning on a partial revamp of the Voxel Editor very soon (for v0.3.4 - I will be releasing v0.3.3 in the next day or two). I am planning on designing the editing mode to be more like MagicaVoxel and Qubicle, including the idea where you "attach" voxels to build something (along with a paint tool) as opposed to the current approach which I think is too tedious.
I'll add your ideas to my list and attempt to get them included in v0.3.4. I definitely want to redo the camera so you can rotate all the way around the model as you suggested, and zooming should be pretty straightforward. I also think the saving of palettes should be doable. It could be something that gets stored and loaded using the application's already existing "settings.cfg" file. I'll keep you updated!