Since jwm only depends on X libs and image ones, the same as Fluxbox, I don't think there's anything more than jwm itself.Can't wait to try it, RS!Re 3.x, 4.x, etc...
Many distros continue to support older versions. Slackware 8 is still supported even though they're now at 12.1! Debian still has repos for Sarge online. Etc. So DSL's overlapping support for 3.x/4.x and now 4.x/TinyCore is hardly novel or confusing if you're used to any other distro. Or even OS since Microsoft supports releases even after new ones come out (such as still supporting XP for however much longer even though Vista is out).
DSL's earlier versions are still available and should continue to remain available for those who have older hardware or who, for whatever reason, are enamored with a particular version number. It's already been explained why the "benefits" of 3.x make it desirable for certain users, and dittos for 4.x. I don't think it's too confusing is people read the documentation and figure out what their hardware needs are.
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How much of the 9mb's are jwm...
My largest stripped jwm binary is 168kb, with every option compiled in. JWM doesn't have any peculiar dependencies.