They definitely do not want to make new reservations for future travel at the RCC, but ticketing is possible.
When I get award tickets for my spouse (different surname) or friends, I sometimes try to sign the waiver forms at the RCC. I have found the agents at LAX and IAD (my most frequent airports) are not familiar with ticketing procedures, but as long as there are not people waiting for help, they have always been happy to get assistance from another agent or over the phone and complete the transaction.
IAD RCCs are usually quiet at the counter because the layout of the airport discourages people from waiting until they can get to a RCC to check in. And that's being polite about IAD. (Besides there is that *wonderful* UA counter at the IAD Hertz drop off for domestic check in.)
On one of these waiver signings at IAD the agent admitted she simply didn't know how to do it. But there was no one at the counter and the other two agents said, "Why don't we show you how it's done; it could be a good thing to know for the future." And the two of them proceeded to tutor the agent I had approached and got her to print the waiver and ticket receipt. Now, that was a good attitude.
I have a great CTO to visit in Santa Monica, where they know all the ins and outs, but frankly I spend more time in the airports than I do in town sometimes.
The RCC agents definitely don't want to make new reservations for future travel; you should always do that by phone in the RCC and then ask for ticketing assistance. And if there are people waiting to check in, give them the priority.
I recently asked for two award waivers to be printed at LAX RCC and one of them worked fine; the other just wouldn't come out of the computer. I volunteered to call 1K reservations and find out what the trouble was and the agent was quite glad I did. It turned out there was a schedule change and the agent had to acknowledge that before ticketing; the 1K agent cleared it up and then the RCC agent had no problem. It's just a case of agents who don't do ticketing as a regular business; if you work with them, it should go fine.
Charles