I don't like too much to dogfight at night; as you stated, fuzeman, I can't see anything.
That said, I don't even like flying some of the planes used in KoTH, nonetheless, I fly them when the winner choose them.
IMO, KoTH is the one event in which the fighter pilot's skills are thoroughly tested in any possible plane. The KoTHer should ideally be able to fly and fight with every plane in the planeset. So, I think it's in the spirit of this event if those skills are tested even in any possible
conditions.
Hence, despite I don't like it that much, yes, I think winner should be able to choose time of the day (even the hated sunset!) and, why not, even if to fight over sea or land - I can't see very well even on sea
(you can choose some map where it can be easily done, for example, Raptor01's North Africa: A1 is a Bish field in Malta, good for fighting over the sea, A8 is a Knight field, in Egypt, ideal for fighting over the desert - no trees there
)