I haven't seen any real fighter jets being able to reload their miniguns.
This. No reloads, overheats is a better way of handling it.
No modern autocannon requires reloading until the craft is on the ground. Look at the A-10 Thunderbolt II, the pilot has the option (it's not recommended but it is possible) to fire 100% of the carried ammunition load in a single burst. The weapon system is capable of holding 1,350 rounds of 30mm AP or HE and its fire rate is around 65 rounds per second. For one gun. Compare that to the 8.5 or so rounds per second of the ED multis and they start to look like properly balanced number blasters instead of real weapons. Not to mention, no designer would add in a complicated and heavy reloading mechanism when the technology exists already (in the 1970s even) to linklessly feed ammunition into a weapon and to restock the empty casings in the drum so they don't become a hazard to the craft.
So seriously, they don't need to be multicannons for that sort of sustained fire rate and they don't need to reload but I would simply be happy with a removal of the reload and the addition of a heat bar. It would also be nice to be able to switch the safeties off and allow overheating the guns in return for module damage (since no vehicle should be set up to save equipment modules at the cost of the entire machine and the pilot and no sane designer does that).