Sometimes people forget to jail as Jailor, which essentially makes them useless for a night. Sometimes you get caught up in something, or you're not paying attention, or whatever. I think it might help out a lot of people if maybe 15-20s (whatever) before the day ends, a message would pop up to remind them if they want to jail someone if they haven't already selected someone.
You basically have to do your night action in advance which understandably people may forget from time to time, especially because with all the other roles you're used to taking action at night, not during the day. Just a simple change that I think would help people out a lot.