In all my years playing GWF, I have never thought that you could freely tag in people like that. I always thought that the only way you could tag someone in was through the (tag) option on the card. I wonder what other little tips and tricks I am missing?
Unlimited tagging on offense...finding the balance on the teams as to who to have in when is one of strategies that makes a good team. Cards that are truly tag guys will have stats that lead to when you want guys on offense or defense on certain levels. Tom is great when it comes to making teams flow...once you find that flow, teams perform to another level.
I will have to say that biggest other strategy decision in the game is the "ch" option on level 3. If you play the advanced rules and decide to roll on the Choice Chart or back to Level 2...there are guys that moving to level 2 offense is the way to go. If you have three "-3" moves on level two, you almost have to forgo the choice chart and take the 50% chance that you are going to get a "-3" offensive move. There are a few gems like that (look at Monolith) which really get an advantage to offense.