I think my description was not totally complete. The usual issue with modal windows in RM is that sometimes you might be in the Edit Person screen and you need to switch briefly to the Lists->Sources screen or to the Lists-->Places screen and then back to the Edit Person screen, etc. RM's modal windows make this very difficult.
Ah! Got it. Yes, you're right, of course. I think because I tend to jot down information (old habits die hard) it is less of an issue for me - but I understand now what you mean.