Just passing on my experience.
If you’ve got a ps2 mouse working I’d love to know if you did anything to get it to work. With a ps2 mouse my cursor goes into “I don’t want to know you” mode, moving EXTREMELY slowly in the general direction of the mouse. Eventually it disappears all together. I’ve looked at inputtrap but the output from it does not in any way correspond to what the doco says (ie. it does not produce any output). I’ve played around with the switches to no avail.
My system is a 2xPIII 450 using the VESA 2.0 driver running on a supermicro P6DBU motherboard with the Intel 440BX chipset. I’m running 6.2 with no updates.
If you (or anyone) has any tips, please post them