Although, Dell have refreshed all of their product lines lately, so even this is outdated advice. Looking through their current lineup and I don't see _any_ with real physical touchpad buttons or pointer sticks, unfortunately.
But I don’t pretend that any of these gestures make trackpads usable.
I haven't been able to put in .Xresources entries to make some other keypad event into mouse clicks either.
https://www.lenovo.com/us/en/p/laptops/thinkpad/thinkpadt/th...
The ThinkPads have them below the spacebar. They are conveniently placed if one uses the little red stick, not so much for the touchpad.