It will work but what you will find is efficency problems. It will also start becoming a problem when you are grinding and have to hit Alt+3, Crtl+1, Shift+2, 3, Alt+5 just to start each fight.

My sugestion if you have the need to have 5 diffrent classes then try to match like spells together. Yout Heals and DPS should be seperate but try to have as many of your dps work together. like bundeling shadowbolt and fireball etc. the more classes you add the more problems that will come up later expecialy as they start getting special skills.

But to answer your question yes you can do it the way you are doing. But i think that later you will find it a pain in the ass to get anything done and you will have a hard time when things start to go wrong. And as you level there is alot more things that will cause stuff to go wrong. I hate alarmbots in Gnomergan.