Where is the fun in that? If we had this option, every single toon would end up exactly the same. You'd completely lose any competitive balance remaining in the game and fight pit would become even more pointless. It's bad enough that people have optimized spirit wolf with movement and starting energy, could you imagine if they could also cherry pick the remaining skills?
By implementing this, it would effectively make runes no different than characters at max rarity prior to runes.