1.- No he doesn't. He did make an appearance at a special after hours party 2 years back. It was called Last Tour to Endor before they closed ST for the refurb. He appeared in Hoopla.
2.- Here's what I think people wanting to meet characters should do:
Fab 4 and R2MK-By GMR
Chewbacca- By ST
Darth Vader-By Backlot
Darth Maul- By Backlot
Bobba and Jango Fett- By Backlot
Clone Wars characters (rotate Ahsoka-Asajj-Comm. Cody, Cap. Rex) By Mamma Melrose
Jedi Council (rotate Anakin, Kitt Fisto, Mace Windu, Shaak Ti) by Mama Melrose
Queen Amidala - By Sounds Dangerous
Luke, Leia, C3PO and R2D2 rotate in the merch. tent
I put Darth Vader 3rd because his line is under a roof the first one is completely exposed to the sun and the second one has some shades from the trees by ST.
The Fab 4 are always the more popular because even if people don't know SW they know Mickey, Minnie, Donald and Goofy and there's no other place to meet them in the park (other than Sorcerer Mickey inside Animation bldg.)