I use an old app that ceased development in 2010, it was by ragingmenace.com and called SideTrack. I was a shareware driver for iBook &? PowerBook trackpads, I still use it on a pair of Pismo G3 PowerBooks & a Titanium G4 PowerBook. Using that app I could set up a hot corner for all four corners of the trackpad to replicate various keystrokes or mouse clicks, so in effect I could set up right (or control)-click using the lower right hot corner. This was in addition to horizontal & vertical scrolling & normal mouse clicks.

streakmachine.10centuries.org.