This is a shameless plug, but I've been developing something involving 'scrolling with a resting thumb' to bring up a quazimodal menu, intended for applications where one is creating content in a spacial context… (i.e. here's a gif demo with Photoshop: https://twitter.com/vivekgani/status/659437589896630272 ) The intent though is for folks that want some middle ground between having to remember a bunch of keyboard shortcuts and mousing out to click something. This is an actual working app that works with Sketch & PS and more apps soon - if you'd like to try it email vivek@thimbleup.com and I'd be happy to share it.
The OP had a similar thing with the radial marking menu, though I've shied away from that approach since it doesn't scale with lots of icons/options unless you do hierarchies - also I simply just wanted to try something different. One random thing I stumbled upon yesterday is an old Autodesk Research video looking testing these versus other methods: https://www.youtube.com/watch?v=YHZB0d20640
The OP had a similar thing with the radial marking menu, though I've shied away from that approach since it doesn't scale with lots of icons/options unless you do hierarchies - also I simply just wanted to try something different. One random thing I stumbled upon yesterday is an old Autodesk Research video looking testing these versus other methods: https://www.youtube.com/watch?v=YHZB0d20640