Today I tried running btsync on said NAS and well... it doesn't work.
uname -a sais:
Linux MyBookWorld 22.214.171.124 #1 Thu Apr 1 16:43:58 CST 2010 armv5tejl unknown
I downloaded and extracted the binary, granted it the correct permissions and it runs good until I try to open the webui. It loads incompletly (fails to load all the images and css and js files) and then btsync crashes.
I enabled debugging but the only thing that appears in the log is this:
[20130327 19:35:19] NAT-PMP