I doubt if this can be done for DVR 1.0, but maybe for DVR 2.x…
Maybe an option of “Keep most recent X” where x can be either an input entry or a selectable option of 1,2,5,7,all (defaulting to all)
This would cover the Sports/News type items as well as shows that you may want to see if missed, but don’t care about keeping long term…
The only caveat would then be what to do (other than manually copying it to another folder) if you end up recording an episode that you want to now keep… Maybe an “archive/keep” option as well so that if an episode is marked “keep” it is handled differently?