I think that all IOS supports DDR. Do you want your backup to cover the primary with 24X7 protection or do you just want the backup to activate when traffic is queued and then shut down until more traffic? Of course, the fancier you get, the more complicated the config. It is all manageable though. This link leads to several DDR sites on CCO. Everything you need to know is there:
http://www.cisco.com/tac/newsflash/acc_dial_100401_seg2.html
I am not a big fan of config maker because it is really intended to get a router off the starting line. Doesn't support "extras" like DDR very well.
Scott