Since the left toolbar has quite a lot of space on larger screens, it'd be ideal if you could pin a favorite plugin or three there. I sometimes find myself using a couple plugins back and forth, but it's quite a few clicks to back out, choose other plugin, back out, choose other plugin, over and over again. It'd be awesome if my favorite plugins were just a click away.

I'd propose the plugin's icon could pinned to the left toolbar above/below the Library, Layers, Plugins icons. It could be limited to 3 maybe, and you could star them or something fro the plugins pane.