read a bit more at MBRA + saltflats.com
MBRA isn't only about landspeed, it (saltflats) was simply the only place i could enter a single MB and "break the ice"...we want all types of racing, including the styles you've mentioned. i too have visions of 30-40mph competitions (by class) on various tracks with various styles.
as far as landspeed goes...the "130 MPH Club" has many many entrants that never attain speeds anywhere near that...again, i refer you to the specialty classes, read the tech-specs for barstools and electric vehicles and realize how easy to setup MB rules off of those.
or, we can remain fragmented, each in our own tight niche, never getting together because "mine's better than yours" and let everything anyone tries be reduced to cussing & insults.
on-topic: i've always firmly felt that there's no way we "force" the law to go away...instead the law will feel forced to regulate all of us off the road. self-regulation is our best bet, but good luck with that...we can't even agree on how to talk to each other, much less what to talk about.