Welcome to the forum, don't worry about being a mountian biker, we tolerate MTB'ers anytime between the hours of 9:00 P.M. and 6:00 A.M. EST or whenever there are fewer then 10 roadies on - line, providing they wait their turn to post
Sounds like if your not bottoming out the fork on big hits the lock-out would be the better option.
2003 Iceman Challenge - 2:34:55 - 897 / 2,000*
2002 Iceman Challenge - 2:39:23 - 1093 / 2,186
2000 Iceman Challenge - 2:49:18 - 1516 / 2,153