Is there a way to limit the size of messages (or attachments) with GroupWise WebAccess 8.0.2?

I've set the size limit for the domain (Client Options --> Disk Space Mgmt --> Maximum Message Size) which is working great for my Win32 clients. It doesn't, however, seem to affect WebAccess users. I've poked around through the other objects as well as the WEBACC.waa file but don't see anything that'll let me restrict message sizes.

Thanks for the help!