The repos got stale waiting for Synology to be added to the ToH so the device could be properly documented.
You can pick that up if you like...
I'm short for time now as I have to find a job...
When get some time, I will rebase and push a PR... if your git skills are good i'm happy to add you so you can help with the remaining aspects ( sdcard + installation fine tuning )
If anyone wants to "pick-up" the work and push a ( clean ) PR... go for it... i'll stick around to try to add input when I have time... But as my needs are satisfied with this device ( been running openwrt for 12+ months ) I doubt i'll be adding much more in terms of "official support" / frequently.