Hi Marco, there are a few commands that do not have any UI set up for them. There isn't a way to show those in the UI right now because the UI has not been developed, like the location of the button and the image for it etc... has not been done yet.
I'm digging into it and, actually I can find several command in the toolbar.
Rebuild is missing, but it's "rebuild" :-)
I've to open my eyes, sorry!
I'm so astonished by the software that it make me blind ;-)
Very powerful.