I don't think it's a big task, they already cross compile btsync for a few architectures. As far as CPU speed, that might be true, it may be slow, but I'd be interested to see how slow.
Netgear has a line of ReadyNAS Linux devices running on SPARC architecture and glibc 2.3.2 on a stripped down Debian distribution. Any chance we can get a build of btsync for this architecture? Either that, or source code to build our own.. Thanks! -Dan