Drawing a straight line

[Scott Slaugh]

I have recently been converting some stacks from HyperCard into Revolution. 
In the process of putting the color back into the stacks, I have found that 
I need to be drawing straight lines with the pencil tool. However, as for as 
I know, there is no key that I can hold down such as shift to keep the line 
going straight, as I can in other drawing apps. Does anyone know of a way to 
quickly add this functionality to Revolution?

Scott Slaugh