This is not a hack, but most of you will find it very useful. 

Team-Up Bonus Calculator is developed by /u/akirajds @ http://www.maacalculator.com/maa/

* allows you to quickly check which combination of heroes offers highest team bonus. This is key for 5-starring missions with least investment of energy.

* there are also filters for anti and pro-precog teams that is especially useful for Spec Ops 34. 

* works for Strike Team bonuses (where you can field three heroes with no agent, like in some SpecOps and Daily Missions).

* the INFORMATION tab allows you to search for highest achievable bonus with a specific hero - which is great for missions with forced team-up.

1. Play smart
2. Then hack
 

You don't need it if you know how to edit xml files. You can create any team and increase either the epic overkill damage triple one hit kill or increase the team up bonus for two of the characters. FYI

From a time/efficiency equation; it's better to do something else (learn to program) than waste energy on  a low payout. 

For Beginners, learning to edit xml will be a much better use of time and return then to brute play.