Last time I checked, TiVo was keeping deleted shows in the trash folder unless and until space was needed. I don't think they even include that folder when calculating available space. I appreciate Channels DVR offering the ability to fully and automatically clear that folder, and to mass delete which TiVo doesn't allow. But I'd also like to be able to turn this off or at least extend well beyond 10 days, in case of travel or emergencies that keep us away from the DVR for several weeks.
IMHO delete confirmation dialogs are always a good idea. TiVo doesn't ask for confirmation when I delete a show by pressing the Clear button on the remote, and I've lost count of the number of times I've had to go into the Recently Deleted folder to recover shows I've accidentally deleted that way. TiVo does ask for confirmation if you delete from each show's menu, and also if you try to permanently delete something from the Recently Deleted folder.