Tommy - We are looking at options of doing this also, would be interested to know whether this work for you or not. In our case we are just looking at the Altiris Package Server on the WAAS device.

As far as SEP goes, this config worked flawlessly and I would have kept it this way if new and increased demands for network bandwidth had not arisen, ex;  Conversion from GroupWise to Exchange (over the network downloads), extreme GIS data demands, increased video conferencing installations, etc. The network activity from these apps in combination with clients downloading megabytes of SEP content daily over the WAN is a recipe for disaster. 

Additionally, I am not sold on WAAS, it appears to be a half baked technology.  We are pulling them all back in and going back to remote site file and print servers.  All remote site servers are now configured as GUPs.  Anyplace that still has WAAS installed is a small traffic office without the big demands for bandwidth at this time.  These WAAS offices still pull all content down from our main office SEPM over the WAN and they work fine.  Get too much in the bandwidth mix and it definitely causes way too much heartache, IMO.