I'd like to put forward what might be considered a controversial point of view:
As it's non-subscribers that are affected by the delay in email verification, and also that to be in a situation where you can have a win claimed against you usually means not logging on for about a week at a time, then I think that 48 hours makes very little difference.
I suggest either: allowing the time-out option between two registered players (if this is feasible and easily implemented)
Or: enabling it full-stop and tough luck on the small number of non-subscribers who might be affected.
Richard (anxiously waiting to time someone out!