The planes for OFP straight suck. Due to the flight model and physics. But there are a lot of mods out there that have the tandem crew concept (limited by the game engine.) 
There is an F-18E/F mod where the WSO functions like a tank commander 
There is a Tornado mod where the WSO is strictly a gunner for the larger  A/g weapons, bombs, JP dispenser, etc. I think the pilot has control of the gun and the A/A stuff and the ability to track targets. 
The F-15E mod functions in much of the same way. 
There use to be a night interdiction B-57 that was tandem crew and the back seater had a bomb sight for the iron bombs. 
  
Let it be known the engine on OPF and Arma for flight is very limited. The AI sucks at ground attack and especially dropping bombs. You will heavy B-2s or B-52 diving in on a target like an A-10. Ai (unless there is laser spot on the ground) will never put the bombs were you want them. Ai almost always attacks moving vehicles only (MTBs are the main target). Bombs function just like missiles (with no booster) and have a very compact blast radius almost like a grenade (they rest is usually visual effects or scripts.) 
With human flight it is still very hard to control, most jets zip across the little maps at 700 kts, and flying them is like balancing a bottle cap on a pin point. 
I love OFP to death and it is my favorite game, but I believe that aircraft are only good for scenery and immersion, I let the gunships and armed slicks do the A/G work. 
  
The best ground attack platforms I have found that were modded for the game are 
The A-1 (easiest to control, you can handle low without worrying about trees, and its payload is a beast) 
The A-26 for its guns 
The F-18F for its payload and heavy amount of scripts the plane has 
The Tornado GR for its payload and its ability to lay down mass destruction 
The A-10 although in dives and at high speed you can loose control.