I always pull the clutch in when I start the bike and always have it in neutral. Just in case it slips into gear for some damn reason. Doubt it would ever happen, but it would be my luck so I do it to be on the safe side.
Clutch pulled IN - bike in neutral -should be no probs.
Clutch pulled IN - bike in gear - will always tug forward. Due to fluid being cold & dragging, usually.
Anything different, get it sorted.
+1 -- Also, the colder it is, the more its going to jump if not in neutral. When the bike is warm, it should start in gear with clutch in without much drama.
My experience is the same as Reverands, just a slight tug when started with clutch pulled and in gear. Thats been consistant with a number of softails.