I would like to see the troop training limits removed and let it be limited only by the resources available. Remove the expanded training boost items from the game and change so that the building level affect the training cost.
When you need to train 100,000 troops or something and you can only do 2000 at a time maximum. there is a lot of pressing/clicking. The amount of screen tapping or mouse clicking involved in the game is very high and I feel this change would reduce that significantly.
Click to get into Barracks
Click on 2000 T4/T5 troops
Click to start training
Maybe click to use resource items
then click on barracks again
then click on speedup
then click multiple time on which speedups you want to use.
then restart that all over again for the next 2000 troops.
The expanded training boost item. just remove them from the game or maybe it so you can buy them and they affect the cost price of training or something else.