Oh I wasn't meaning Apple forbids 3-button mice, but just a side remark at the fact that they only create one-buttoned things. I do have a 3-button mouse I plug occasionally to my Mac, but most often than not I forget it at home (or I'm too lazy to pick it up) and having this keyboard fallback is neat: so far I have used 2-1 VERY sparingly because of it.
There's also a patch lying in the internet (or the group archives) using trackpad gestures to get this. I think having gestures is a good way to go in this particular case, but since my Mac is old I don't have multitouch by default (I have a Magic Trackpad for that.) I think I will add that patch and check how good gestures feel for the chording in Acme.
I'm not sure how/what could be used as gestures in a "Plan9 world" but this is probably because I don't use Plan9 enough... I do use Acme daily for my unorganized writing and occasional go tinkering (still not far from being a "hello world" go programmer,) emacs for the rest of the writing. What do you think would fit the model (inside Acme, I mean)?
Thanks,
Ruben