It would be easy, but it would IMO be misleading also.

An arbitrary example:

Rule 1: 22:00 - 06:00 Profile silent
Rule 2: 06:00 - 16:00 2G on
Default rule: Profile ringing, 3G on

So default rule would be shown as blue during 16:00 - 22:00. The problem is, that default rule has actions for the other times also. 22:00 - 06:00 Rule 1 only sets silent profile, but from default rule 3G is activated since no other rule during that time set the mobile mode. 06:00 - 16:00 Rule 2 only sets 2G, but since during that time no other rule sets the profile then the profile in default rule is activated.

So if I only showed blue bar during 16:00 - 22:00 for default rule, I'd be giving the impression that it's actions are not applied in those other times. But that is not the case here.

Did that example clear my worry at all or did I just muddy the waters further?