I see Lee Valley has an interesting add-on for their bevel-up planes.

From their website;

The fine thread on this Norris-style adjuster slows blade advancement, making it easier to set blade projection precisely. An easy retrofit for our bevel-up planes, it simply replaces the regular adjuster supplied with your plane. Made in Canada from stainless steel
I'll probably get one of each and try them out.

slow_adjuster.jpg