1/ Yep with each one a controller, it's possible, 2 players single match or even 4 players double.
2/ Well, thorically Manutoo provided a new way to create mods .ini's so that several mods can co-exist on the same TE installation
,but none of us modders used it 100% properly yet, so for now, you should simply use several installs of TE (and use the mod you want
on each distinct TE installation). You don't even have to use TE main installer multiple times. Just install TE one time, then
copy/paste duplicate the Tennis Elbow folder (renaming it the way you want depending what you intend to do with it), it
will work as TE doesn't use windows registry keys, it's a 'portable' installation.
I forgot about this one, if i remember well with AO2012 scoreboard there was an issue with the stamina bars disappearing right ?
I just checked my TE and for some reason i can't reproduce this issue, it works now. So i don't know, i may try to fix it if i see again
something going wrong, but scoreboards are not my priority for now.