Thanks Empty Cruise.
After Googling for a while, it looks like differential braking should be used if rudder does not do the trick if you're starting to skid away from the centerline (makes sense at lower speeds). Definitely not tiller though!
And as for braking/reverse thrust, I found a Flight Safety study that shows that thrust reversers decrease braking distance by about 15%. Not as much as I thought. I guess the majority of that 15% is in the first few seconds after touchdown.
P