If Clickteam Fusion 2.5 doesn't have this feature to check that if Active is close to another object by X pixels then action, you can include it in the new Clickteam Fusion for the users!
It will get turrets for example to shoot only if an object is close enough to their range! Please consider adding this feature to it even now!
-Distance of Soldier1 is close by X or less to Turrent -> Shoot bullet
-Distance of Light3 is close by X pixels more to Battery1 -> Make light3 transparency ink effect value to 32
-Distance of alien is close by X pixels to Detector -> Play sound Alarm.
I hope that CF2.5 already has such feature because if not, then clickteam must add it under "distance to another object"!