Would be nice to have some sort of safety option to not accidently cast damage spells on own team members.

I wounded accidently my main char because he was in front of the enemy and my mouse moved a little bit a split second before i clicked.
Which can be fatal ofc.
Sure that was my fault but stuff like this could happen in the heat of battle wink

I would suggest you need to Ctrl+Click or something like that to be able to cast a damage (or negative effect spell or any other sort of attack) on your own party member.