As of some recent version, Kismac now displays the traces where I have had a fix, and no trace when the fix was not available. I can live with that, actually, I'm very happy with that. In fact, I'm so happy with it that I would like to be able to save the trace from Kismac.
Hahahahah... that's the best way to make a feature request I think I've ever heard. I haven't played with saving traces... perhaps I should... or perhaps Mick should. I won't have time soon, and probably neither will Mick, but it's a good idea. I'd like the trace saved in a format that's compatible with *something* else... perhaps MacGPS Pro?