Enable other skill cast while holding down (spam) a base attack skill

Hi!

Enable other skill cast while holding down (spam) a skill with left-or-right mouse button.
Tempest Flurry or Ice Strike and Tempest Bell for example. Right now can not cast a different skill when holding down Ice Strike for spamming that skill.

Would be good to have cast the less frequently used skill occasionally while we are attacking with a base skill (Tempest Flurry or Ice Strike what I have used).

Thank you!