I think that there should be a pickaxe limitation
Like if you have a maxed out pickaxe then you must not be able to mine in smaller mines like in a, b, c etc.
Because it will become too overpowered and will not let the other lower level people mine in the mines with the people who have maxed out pickaxes.
I mean like everytime they [people with ranks of Rogue-3 or something like that ] try breaking blocks in mines such as A, B,C etc they should get a message saying [!]Your pickaxe is too powerful for this mine[!] Or something like that
This would greatly help the beginners who will be able to mine in the mines without some guy with exca 3 ripping the whole mine apart and refreshing it every 2 seconds