The problem is those "early models" were the vast majority that actually went into combat. You would have a hundred planes take off and only 50 make it to target, for all the failure rates it had. Most of those that did serve were on the Soviet front because they could fly higher than the low-alt VVS planes wanted to, and even then their true impact on the war was very limited.
IMO it's only a "wishlist" item because folks think the German planes need a B-17 equivelant. They don't. They need representative planes that are more like what went into combat, and more like what the allies ran across in combat.
If they actually knew anything about the German aircraft and their use in the war, they'd be asking for Ju-188s (also not too poorly armed) and/or Do217s, or even a Ju-88A-1 (much more needed for BOB than our Ju-88A-4). They'd be yelling for the He111 before the thought of a 177 ever began to form.
They just see the 177 as a LW B-29, which is wrong. IMO I don't think this game will ever "need" the 177, ever. There are far better planes to add that saw way more service in all theaters, that would easily take its place in any of the.. oh say "two" scenarios/planesets that might be able to use the 177 anyways.