Help with Javelins

[FenrirsWrath]

Is there a hot key for soldiers to unleash javelins? I use fire at will mode for my infantry that have them but they seem very picky about when they will actually throw them. Lots of times I have to keep maneuvering them around to find a certain distance or spot where they will actually throw them. If I left click once on an enemy they will usually only throw one round than charge. Can anyone help me out with my javelin tactics?

Edit: I probably should have put this in the game guides section, sorry.