BUT that was not your question was it (;-) HOW to do a right mouse click by button ??? Have you tried MOUSE KEYS ?? I know it can be done from there. With mouse keys you move the cursor with ley presses and left click with a keypress and right click with a keypress.

You will have to TUNE the MOUSE KEY to make it usefull and smooth.

Do a serach on Linux mousekeys.

(;-) TP