@junaruga That seems to have gotten it. After adding that quirk and rebooting, drag behavior is now what I would expect. I can now click and hold with one finger and drag with another.
As for right clicking, clicking in the bottom right corner now functions as expected. I may look into changing this to being generally on the right side of the trackpad instead, but I’m happy to have the functionality at all for now.
Thanks for your help!