Guild Wars 2

If there a way to have less of them in reward tracks.
I play mainly in WWW and sometimes I do my daylies on JcJ, so I have a load of them that I can’t use (well 10 a week if I am motivated to do a key farm, not very often) and they are of no use to me, since I don’t want to make another alt I won’t use.
Please can you make so we get less of them or give them some use (like when you have 100 of them you can level 1 mastery level)
or something like that

You can click them on a 80 lvl toon and get spirit shards instead of level up. How to get rid of the spirit shards is a different issue.