Runequest 3, house rules, Borderlands and questions

Greetings gang. I am looking at running Borderlands for a group that is quite new to Glorantha (with the exception of one player) and got to pondering. * I am leaning towards Runequest 3 since I feel it fits the best balance of things I want (robust rules without too many options to overwhelm the group, multiple character creation options, rules for a ton of critters and gods etc.). It's also the one I am the most comfortable with, and since I'll be running it for a fairly large group

I couldn't quite grasp the RQ3 rules about movement -- the wording wasn't clear at all to me -- until... ...which basically helped put everything in place. So the whole thing about "Attacking on the Run", for instance, which reduces your movement to 2m instead of 3m per SR, that's only for the SR on which you attack on the run, then, right? Like, in a melee round, you could be running full speed (3m/SR) for a few SRs, then attack an enemy you're running by (only moving by 2m on that SR) a