kalashnikov01:

I see no one has replied, so I thought I'd share some options for you to consider.

There is an online war that has exactly what you're looking for (although we don't have the Ju-88.  For bombing, we have the He-111, Ju-87, FW190 JaBo, IL-2 and A-20).  Unfortunately we don't use CFS3.

And yes, you can move around to the gunner positions.

If you are over 18 you can apply for free membership.

The website:  http://www.forgottenskies.com

If you aren't eligible for ForgottenSkies, then there are usually servers in HyperLobby (again, not CFS3) and depending on the map, there are often bombers available, with appropriate targets.
 
There are different rooms, the one you might be interested the most in is the "COOP" room, where there are public COOP missions hosted that anyone can join.  You can go to http://hyperfighter.jinak.cz/ right now and see how many players are currently in there, displayed on the right hand side.  You will see that most players, usually a few hundred, are in "Forgotten Battles", which these days is really "Pacific Fighters - Merged", which means IL2:FB+AEP+PF+3.03 patch.   I think the software might cost about $50 total, maybe less.

(just between you and me, my real name is IV/JG51_L.Z  )

Salute!