My issue with rerolling perks is that if I want a perk that costs alot of points of for example the green boots type and I have already one that costs 5 boots, and one that costs 4 boots, then I cannot reroll them into one that costs 11 boots.
I suggest that when you use your retraining points u can instead REMOVE a perk, so that you can remove all the perks you dont like, and then reroll so you have a chance to roll the high costs perk. I realize that if you try to reroll them one at a time to a 0 cost perk you can get around this, but this just feel like making this unnecessary difficult for the players.
I hope you (devs) will consider this suggestion, and I would like to give you a shoutout for being so amazing at listening to the community on the feedback we give you!