Those are in the q2 WOD mod. But, they made them laser trips (required plasma cells and grenades to set, I will post a pic later). Needless to say this was a very effective 'STRATEGY'. Why? Becuase it slowed down the all out assults and ruined months of practice and made teams work differently every round becuase the can be placed randomly any where that can be reached. In a sense making the flag non-reachable unless you were smart about it. For instance in this game your team would have to take out the whole flag area with a well toss nade.
*good idea since this is not a realistic paintball game or is it?