Much like we have keyboard combinations for switching between for example scaling, rotating and moving objects in the viewer, I'd like to have a quick way to switch between World, Local and Reference modes. I often need to switch between especially World and Local when moving stuff around.

By the way, an additional "Current View" mode would be much appreciated, where one axis is straight out from the center of the camera / viewport...

I'd categorize this as both User Interface and Content Creation if I could use tags instead of categories...