Can't Taunt More Than One Unit?

[Zoldam]

When I try to change the taunt spell (Mountain Giant or neutral creep), it won't let me set the number of enemies taunted any more then one unit (If I type in 5 or something, after entering the number it resets to 1). Does anyone know what is up with this? Or a way it can be fixed (Or tricked)?

 

[Veritas 117]

You could try holding shift while you double click the field you want to change. I'm not sure why it wouldn't let you do it though... That is strange.

 

[Vinz]

I remember seeing it at 0. For some Ability Tab fields 0 means infinite.