Removing Autocast

Is there any way to remove autocast feature from a spell? For example, I wish to remove autocasting from bloodlust, but there is not a "Autocast: True/False" field in the ability's properties. Is there a way to do this?

None, really...

You can however give a unit a different, non autocast spell which does nothing except target a unit, and then cast the bloodlust with a dummy caster when the spell is cast.

or

You can find a different spell that has the effect you want (speed bonus) and use it instead of bloodlust.