Feature Request - Load Throttling

[Marc Perkel]

If you aleady are doing this - then thanks. But here's a feature I'd 
like to see.

Rsync often puts a lot of load on the system because of high disk 
access. I'd like to see rsync become "load aware" and to slow itself 
down under high load levels. Seems to me that it could be something 
fairly easy to add to have it check the load levels and back down so as 
not to slow down the system.

My 2 centz ...