I really love addins but you only have to install a handful before the 'Addins' drop down menu becomes a over-long and a drag to use. ()
A user's only option around this is to assign an addin to a key combination directly, but if we look in Tools -> Modify Keyboard Shortcuts we observe that RStudio already has many more commands than are featured in the default keymap. Key-bindings in R-Studio are a scarce commodity.
The way that other editors (E.g. Atom, Sublime, VSCode) deal with this situation is the 'Command Palette' -
A kind of command search box. VSCode's amazing extension ecosystem is facilitated in no small by part by its slick command palette, see: Visual Studio Code Command Palette. I would really love to see this feature in RStudio. Who agrees?