Back in early Aces High days, our G6 DID have the 30mm as an option. Our G10 also had hub 20mm and 20mm gondola options too, if I`m remembering correctly. It had the hub 20mm for sure, but I`m fairly sure we could add gondolas to the G10 as well.
2 points:
Our previous 109G-6 was set up more as a later-war mixup, with a 30mm option but without the later-war engine power. So it was a bit of a Frankenstein. It also wasn't very useful in scenarios and setups and planesets that needed the early variant of a G-6. The 30mm threw it all out of balance.
Second: We never EVER had a G-10. That's the issue with your second comment. We always had a K-4. The performance specs were always K-4. K-4s and G-10s were not identical. The G-10s had a LOT of variation in performance. Some were literally no better than late model G-6s from which they were converted. The G-10s were to hedge bets in case the K-4 took too long, but then the G-10 ended up taking just as long and they both came out at the same time, with the G-10 being inferior to the K-4. It didn't even fill a planeset hole, since both airframes went operational in the same month of the same year. The best of the best of the best, the most pristine examples, in the best case scenarios, were still 10+ mph slower than a K-4 in similar loadout conditions. This, however, is not representative of actual war-time performance, and is a "clean" test on a perfect machine. Most were much slower. What we had was a K-4 with extra guns options. It was called a G-10 to justify the guns options. Why? Because it was a first-gen fighter when this game was new, and there were a very small number of planes in the game. It was called a G10 and given those guns options to simply get more variety from a game that needed more time to grow.
Now that we have grown, grown, and grown some more, we have long-since outlived the need to lie about what variant we had. The guns options were removed, the name was changed back to what it always was (K-4) and we are better off for it. Nor do we need a "real" G-10 to be added to the lineup. Instead, what would be MOST beneficial would be a G-6/AS, which has all the loadout options of a later G-6 (and what our old "G-10" used to have) but with the high-alt supercharger setup for better performance in the thinner air.