There is a lot of discussion on this forum about what people expect SU to be able to do. It often seems to come down to keeping a balance between the overall simplicity and lightweight nature of SU that we all appreciate and increased functionality. For example, I find the omission of an inbuilt Copy and Mirror command odd because I am so used to it from earlier software I used. Both can be done in SU but not as simply. Other people clearly find it no loss at all.
Is this idea mad? What about having a hot key that results in a pop up palette near the cursor that is user defined. You could have as many or as few icons in a grid and you could set them to inbuilt functions or to extension functions. It’s pretty much the same as most of us already have in the palette along the top of our screens, but that has some disadvantages: it takes up real estate all the time and tends to be far away from where you are working.
You could further enhance it with call outs to keep the main palette modest in size. Like right clicking, the menu/palette would disappear once a command had been invoked.