For my solitaire leagues, I do the following.
Before I throw the pass, I measure distance from QB helmet to receiver helmet, much like pass simulation.
If the TTQB pass is complete, the receiver is replaced by a referee on a magnet. All unengaged defenders are then turned toward the target (or, strategically deeper, to cover in case primary tacklers miss). The board is then turned on:
For 0-21 yards: 1 second
For 22-42 yards: 2 seconds
For 43+ yards: 3 seconds
This limits yards after catch, but gives a talented receiver base a chance to weave his magic through the secondary if he's good enough. If a defender touches the ref during the allotted time, the play is over.
Ed
