Some custom tools make extensive use of VCB input, (I’m thinking of Fredo6’s excellent work with Thrupaint), and unfortunately if the user has shortcuts assigned to these inputs, they get intercepted and often transfer control right out of the tool.
I wish for custom Sketchup Tools to have their own scope for shortcuts, or at least to ‘shadow’ the shortcuts of the application. This would allow custom tools to become more of an editing ‘environment’. Blender, Modo, and many other applications all allow shortcuts for a particular viewport context, and it really helps when there are a very large set of tools available. Out of the box, Sketchup doesn’t have this problem, but for professional users using lots of plugins, we’re running out of keys.
(I also support the idea of multi-key shortcuts, or chords, as long as the VCB still works!)