"I am an absolute niche bu I'd love to see better x86 (well, x64) support"

I'll second that, maybe not for the same reasons.

I have numerous static binaries built for x86-64 that I would like to be able to use on new OpwenWRT installs. Because the OpenWRT x86-64 support is lacking I only use it on MIPS and cross-compile or, if it is a tiny program, compile natively on the router (slow). And I stick to NetBSD for x86 routers.