Ford only offers a standard open diff. Quaife makes a Torsen-style diff (technically not a limited slip) which is the hot ticket for a front-driver, but it's $1000 + installation.
I got the base model 5-door SVTF, so I can't answer the traction control questions.
The SVTF does very well in auto-X, even bone stock, at least from everything I've heard. I'll have to try it early next year.
No SVTF in '05. '04 will be the last year for it.
'03 CD Silver SVT Focus 5-door, #2001 of 2173
(and a '89 Mustang 5.0)