I would like to point to this discussion here:
We have a similar issue where we want to sync Config Files, particularly for Dynamic Modules. Yes, we would like to choose which Configs we want to be synced. We want to move these Config files in the DB but we can't until we know Site Sync would also look after syncing configs stored in DB.
+1 to the idea of syncing resource files. Additionally, being able to sync Site Search indexes would be great too.
Would love to start seeing better error messages. Currently, we have over 7 sites that we sync. When there is a failure for a page for example, we can't tell what particular site that page didn't sync for. We often have to check ELMAH logs on the destination server to see a more relevant error message. The Site Sync results page and the ELMAH logs on source server don't give us a better idea of why something failed.