Confirmed that award tickets can't be booked at a ticket counter after conversion to SHARES.
For what it's worth, the GUI based front-end to SHARES that US Airways uses seems to work pretty nicely. In my opinion, integrating the two systems before this is ready is a mistake.
On the other hand, UA agents will gain faster typing skills--I swear some of the CO agents are cranking out 100 WPM when they're using SHARES.