Layout Library

It may not be this important at the moment, but a library for different layouts would be neat to have. Like in Blender, where you have different layouts for different tasks. One for UV, one for rigging, one for modeling, one for ...

If NVIL stays an application purely focused on modelling, I don't see how this could greatly benefit the UI, since you would just need 1 or 2 layouts: one for modelling, one for UV layouts.
So, I think you're right, at the moment it is of little use. But at a smaller scale it reminds me of the switch you can make in Maya via the F2-F6 keys, or the shelfs. If the User Toolbars would be more like the shelfs, by that I mean being arranged in tabs, that already could benefit the workflow.