It is great that we don’t have to train heroes one by one,. I mean nice to have that +/- buttons to manage the queue for the same training type. This way we don’t need to check our phone every 1/2/10/30 minutes or so. It would be really hard to interrupt our sleep cycle, or our work wouldn’t it?
So Queues are great! Why not have more?
Assume you have 7 backpacks and you want to get those 1/2* heroes from TC2 to quickly level up some more for incoming war. But too bad, it is already 2am, you need to wake up at 7am and cant afford to wait for it. So you check if you have enough Recruits and Wooden Swords to fill TC1 queue enough to match your sleep time, but no you dont have enough. So what you end up is going for TC11 and getting only 3 heroes.
If there was a type-independed queue like those in some RTS games, you would just add those 7 backpacks for TC2, then whatever wooden swords you have left for TC1 and then 24 hours of TC11.
This would also help to minimize Idle Training Camp time.
And it would be even better if there is an option to edit the queue order!