Why is it that when I increase the rank of Explosive Mines, I throw more mines but my max amount of mines doesn't increase?  I'm fine with only being able to have 6 at a time, but I dont like being forced into using three in one location.

I need to put more points into the skill to maintain their effectiveness as the game progresses, but throwing three at once hinders my ability to be strategic with them.  What if I want a few in each lane?  And what if I don't want them next to each other but spread apart?

I would suggest the cooldown reduced on the mines or removed entirely, the set-up time for the mines increased slightly (that is the time between when the mine is laid and when it can detonate; note if you lay a mine right under someones feet there is a delay of around 1.5s before it will go off), and allow Regulus to lay one mine at a time, thus fully preserving the strategic element of this ability.

There probably also ought to be something on Regulus' HUD showing how many mines he has active so its easier to tell when one's been detonated.