emulating 3 button mouse

my new Dell laptop (running buster) has a trackpad with only 2 buttons 
(areas really) how do i get it to paste like i want (by clicking on both 
buttons simultaneously?). i use KDE (and also sometimes a console (with 
gpm)

some dmesg output follows

3.008497] psmouse serio1: elantech: assuming hardware version 4 (with 
firmware version 0x4f1001)
3.018097] psmouse serio1: elantech: Synaptics capabilities query result 
0x01, 0x17, 0x11.
3.028001] psmouse serio1: elantech: Elan sample query result 00, 2d, 85

please let me know if there's other info needed and i'll happily provide 
it

    thanks ever so very much in advance,
          ~c