I've seen this mentioned many times, I thought I could post the idea here for more visibility:
Problem:
You want to re-spec Rogue to a different build type, but want to keep your old build powers.
Solution:
Either modify the powers tab specifically for Rogue or enable the players to purchase an additional feature on Rogue.
Example:
I want to run a danger room with my friend. I want to be tanky so I steal moves that help me be tanky.
I then want to run a terminal with my friend. I want to deal more damage. I want to be able to switch my loadout rather than respec (and lose) my tanky build