Back on the old SBS servers you could change the web.config file so users through RWW could get access to shares located on other servers, however this no longer works it seems on 2012 Essentials!
The fix for SBS 2011 and before is here: http://johndandison.com/blog/post/2011/04/16/Network-Drives-on-SBS-2011-Remote-Web-Folders.aspx
Has anyone been messing around, or knows of a cheeky workaround, I've tried mklink's but (as I thought) that hasn't worked.
Cheers!