At this point in time, there is no plan to be able to associate a single user with multiple patrols. We understand that it would a useful feature for some TT users, but the demand for said feature is not high enough for us to be able to devote resources to a change that would be very complicated and time-consuming, as Matt stated in another post above.
As far as other solutions go, the only options are to merge the patrols back into one, give the leader Troop level access, or create two separate accounts for the same leader (using one to access Patrol 1 and the other to access Patrol 2).