*Edit* found the answer it's: g_bugMelee 1

I notice on some servers you can alt-fire jab, kick, and flip players when you have 0 saber force skills (punching only).

Others you can only punch.

Is there a specific setting for this?

Example, this server allows alt-fire punching with kick:

EV1.NET Jedi Academy 216.12.193.104:29070

This one does not:

#myRuSh jk3 Public Server by [ www.multiplayer-action.com) 62.4.81.244:27100

What's the server setting to enable alt-fire punching (for kicking and flipping and jabbing)?

Thank you. :)

Yup you found it out. I run g_debugmelee 1 on my server, so you can do all that stuff.

By default Punch is just punch.. there's no grapples or kicks.

Though with melee you can still do most of the saber acrobatic moves IIRC, so long as you have whatever force is required for some of them.