Feature Request: Different pen for right-mouse button?

[rossc719g]

Several of my use cases make use of two pens, using only the mouse (no keyboard available).
E.g., I like to use gink for puzzle games to think through moves before making them. (E.g. minesweeper, hexcells, sudoku, etc..) And two colors are very handy for this.

It would be nice if you could assign a different pen to the right mouse button so you can use two colors without going down to the tray to click each time.

Right now, the UI shows a tiny dot next to the active pen, and if you draw with the right mouse button, it is the same as using the left button.

What I am imagining is that by default, the right-button-draw action is the same as whatever the left is, until you right-click a pen (or tool).. at which point you'd get a second symbol (unfilled dot? an "R".. whatever) next to it, allowing you to assign two different pens/tools to the two mouse buttons.

What do you think? Useful idea?