So my grass was sprayed for weeds today and I need to water it in. I have already done this once, so I have a disabled schedule set for "Every Day at 5AM". So I could just turn this on and turn it off again tomorrow. Or I could turn it on and adjust the End Date for tomorrow (and hope that End Date includes tomorrow, and not stops tomorrow, but maybe it does). Or I could set it for tonight at 10:30, but then I can't actually set the End Date for today even if the time is set later today.
What would be nice would be to set the schedule to just "Once" and have it auto-disable itself after the next run.
Or perhaps there is some other way to deal with this situation (which can't be all that uncommon - other people must deal with watering in weed sprays and such).