Eskero: The pen and paper RPG system

See I'm just thinking about the awesome mechanic now, and ways to use it to do cool things; like what if Alchemists (Due to the way they use songs) could add a number of extra unkept die to a pool, but those die were a different colour (Or just rolled to one side). So when they rolled they'd find it easier to get their pick of result, but special and potentially unwanted things might happen if they end up keeping those extra dice? Like e.g. ordinarily they have 4keep3, but they use their ability to make it 7keep3, because they really need to make sure they have enough range to get the result they want, and the dice come up, 9,2,5,8 (8,4,1) and they really need the 25+ result so they have to take the 9, the 8, and also the 8 from the special pool, which means fun times for the GM.

Alternately all classes would be able to do this, but they'd do it in slightly different ways (Perhaps this would be the special luck type mechanic with limited uses) e.g. Braves get more bonus dice, Alchemists can ignore a limited amount of extra effects etc.

EDIT: Gods I am fangirling over potential mechanics, what is my life?