Well, lets be true to life with it. IF it ever gets in the game, make it a requirement to have someone join you (since the all throttle and flaps were operated by the flight engineer) before you could even start engines, and both parties would have to pay the perk fee!
B-29
20,000lbs
357Max/220Cruise
Ceiling 33,600 Ft
B-17
8,000lbs
287Max/182Cruise
Ceiling 35,600 Ft
B-24
8,000lbs
290Max/215Cruise
Ceiling 28,000 Ft
Lancaster
14,000lbs
272Max/200Cruise
23,500 Ft
Quick info I got from the devil (Wiki) but should be accurate enough to show how much devastation would follow the B-29 (60,000lbs per formation!)