Mask Pen tool - Straight line
Be able to create straight lines when you use the custom mask/pen tool when you're cutting out a custom shape. Holding down shift or alt when you click to create straight horizontal or vertical lines.

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Leigh Edwards commented
I have just spent ages googling how to do this. I can't believe this is something not already implemented.
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Emile Rizk commented
Yes please, I can't beleive it's not talked about more. When doing a quick mask in premiere and you want to hold down shift so that when you move the shape of the mask around it keeps it straight with 90 degree angles. BUT NOOO unlike every other adobe application when you hold shift the line snap to a point but it's never parrallel or a perfect straight angle from your other point, it will be slightly be higher or slightly lower, leaving you with a mask that has wierd non 90 angle and it's all skewed, very frustrating, I don't want to have to open after effect to do a simple quick mask that take 2 sec to make in premiere. ITS BEEN LONG ENOUGH PLEASE FIX, just make the shift do the same thing from all your other application....