It would be nice if the "to do" list also showed a column indicating how many tuners are active. I know they show when scheduled recordings begin, but there is no way to assess how many are active at once since you have to remember when each program ends.
Barring that, then some visual clue when on the upcoming schedule you have reached or exceed 4 (or 6 tuners) as appropriate.
Right now, you may be bothered to see the priority took over and you lost a program you didn't really want to lose. With too many season passes you may screw up the priorities inadvertently.