Internal limiters indeed act as droop screws on onroad cars. On my car, I use between 3 and 6 mm (yes, I'm metric
) depending on the amount of grip.
As long as you use smaller piston holes and/or thicker damper oil, big jumps won't be much of a problem. It's not like you need fast shock action to absorb bumps and ruts.
Sway bars help to reduce grip rolling, but not nearly as much as shock limiters. And I don't like the feel of them, but that's personal taste.
Also, try to use hard foam inserts in your tires. If you're going after Schumacher tires, order some of their blue inserts too.