Don't put them on separate frequencies from the computers! In fact, put them on the wifi. Give every loco an address, and control them that way. (If you think about it, that's more or less what a DCC system does today, except that it's called a CV instead of an IP address. We put them all on a single network - the track - and signals are broadcast, with only the recipient acting upon the relevant ones.)
Someone - Tam Valley Depot? - is already working on a way to use a radio controlled, battery powered adapter for DCC systems. So you can use your DCC systems as its - the control goes via radio and not via track. The technology is not quite there yet - the problem is not enough power, from what I understand. But they'll get there pretty soon. I'm not sure it will fit in N scale at first, but I would assume it'll work its way down to N and even Z eventually.
Someone - Tam Valley Depot? - is already working on a way to use a radio controlled, battery powered adapter for DCC systems. So you can use your DCC systems as its - the control goes via radio and not via track. The technology is not quite there yet - the problem is not enough power, from what I understand. But they'll get there pretty soon. I'm not sure it will fit in N scale at first, but I would assume it'll work its way down to N and even Z eventually.