I'd love to customise Photo (or Designer). A combination of the following would be useful:
a custom shelf, or persona with say, up to 9 positions that can be anything, and I really mean anything: a brush preset, a tool (e.g. brush, spline or lasso selection), or just a toggle like "protect alpha". Or rasterize layer. You get the idea.
directional gestures, or flicks. The sweet spot for these seems to be 6, which means I can have super fast access to 6 more controls that I find important. Could again be brush presets, filters or any command/menu within Photo.
Background: I am painting a lot in Photo. This means that I use some tools quite often, while others I hardly touch in weeks. Things like the polygon lasso tools force me to switch personas in order to create a selection, and switch back in order to move the selection. This is crude. I'd rather customise an additional persona to my needs and never look back
What do You think?