MU4 Icon only side bar button

I am loving MU4 and the amazing usability and graphic improvements it brings! I would like to suggest to allow the possibility to display only an icon in the side bar buttons that open the palettes/properties tabs.
I like that there is no possibility to resize the side bar since everything inside is wonderful and tidy. I think that having an (opt in) icon only tab button in the side bar would keep things nice and tidy too. My suggestion derives from the fact that when adding a fourth tab (in my case the "selection filter" tab) to the side bar, the text in the buttons is hidden and cluttered. I think that having the possibility to display only an icon would work wonderfully, maybe with the full name popping up on mouse hover.

I attach a screen shot