IMO... none of the bombers mentioned would warrant a perk score applied. None of them can do anything special and they certainly do not perform any better than what we already have.
Actually... if we were to look at the cabability to bomb targets we have now and just how awesome those platforms are, I'd like to think HTC would put a small perk on the Lancs, B24, and B17. If HTC is into perking the "cream of the crop" fighter planes, then why are not the best of the of the best bombers perked? The lone perked bomber is simply fast. That is it. It carries as much ord as a B25 (3k lbs).
Stop and think about it.
The Lanc can carry 14/1k bombs. One single bomber can take out almost 5 hangers all by itself. Take the 1/4k and 9/1k package and no CV is safe either. The Lancs is truely under-appreciated for all its power. Players will simply up and ho-hum to a target, drop the ord, and if they get shot down or bail "oh well". Add a 10pt perk score to it and all of a sudden it becomes something that has to be managed just like someone does when they are up in a Tempest, F4U-4, etc. Mind you, that would be 10pts per bomber.
The B24 can carry 4/2k bombs or 8/1k bombs. That is far more massive than one thinks. The 4/2k bombs allows more precise dmg to be done to a single target. I have not paid much attention, but I would have to think it is the #1 bomber used to attack the HQ because it is far more able to defend itself and can fly faster than the Lanc and be more precise. Add an 8pt perk score to it and all of a sudden it becomes something that needs to be managed. Bombin' and bailin' or getting shot down becomes a concern (mind you, that would be 8pts per bomber).
The B17 cant carry the weight, but it can carry the ord. No other bomber can carry as many 100lb (24) or 250lb (16) bombs. So what one might ask? Well, load up a flight or two of B17's and set the salvo to dump it all and have the delay set at .35 to .60 depending on the angle of the run (perform run at max speed) and anything and everything that is able to be destryed by a 250lb bomb will be down. Talk about prepping a field. Keep in mind, if a flight of B17's drop 100lb bombs, it is actually 300lb's hitting the target so when wanting to prep or strat/pork a field... nothing beats it. Nothing will be standing save for the hangers. Oh, and the B17 can still carry 6/1k bombs, too. Not bad at all. A single B17 cant quite take down a CV, but that what squaddies are for.

One flight of B17's can take down six hangers. Quite impressive. Add a 7pt perk score to it and the fly over target, drop bombs, let bombs impact,... and bail becomes a less likely event.
One could make a case for the Ju-88 as well. It can carry more ord weight than the B17 and can perform two missions in one bombing sortie. The first pass can be to carpet bomb with the 20/100lb bombs (remember, it is 300lbs hitting the target so anything other than a hanger would be destoryed), and in the next pass or two it could take out up to 4 hangers. Oh... and the Ju-88 has an awesome ability to carry 2 torps as well. It takes 3 Jap/DE torps to sink a CV, so one flight easilty has this task under wraps. Quite impressive, really. I would imagine a perk score of 3-5 would be sufficient, if HTC goes this route.
One can only imagine just how quickly people will cry over this proposal. But seriously... stop and think about it. Think about the capabilities each of the above bombers have and what they can do and how they are abused or taken for granted (bomb-n-bail). Oh... and how many bomber perk points are building and building and building and not being used???