I have the same problem and use MirrorSync 3
I can then have FMS for each off locally but have data being moved to my master machine every 60 second.
Not natively no.
You can use third party services or create your own way of doing this.
FileMaker did experiment with multiple servers running simultaneously for failover situations, but that hasn't evolved into supporting load balancing or replication type setups yet.
we have done server to server syncing with MirrorSync; however this has already been discussed. Many of our clients use Microsoft RemoteApp to stream FileMaker to long distance users. It can be much, much faster on complex solutions.
if you are interested, we offer a free trial to test with.