I use similar solution: my own shell script with inotify + timeout + unison over ssh. Unison is much better suited for two-way synchronization than rsync.
I now use rsync for bidirectional mirroring (any two versions from the last 15 years or so can talk to each other), git for synchronization (getting history for the price of needing to add/commit). Can't beat the network efficiency and compatibility of these two.
Edit: I am now noticing this tool isn't even maintained anymore.
"Rsync is a mirroring tool; Unison is a synchronizer. That is, rsync needs to be told "this replica contains the true versions of all the files; please make the other replica look exactly the same." Unison is capable of recognizing updates in both replicas and deciding which way they should be propagated."
(your profile mentions to respond to one of your comments if someone needs to reach you ...)