In AngelCode's Bmfont is there a way to make it so that all of the widths are equal?
No. You can't do that with AngleCode's Bitmap Font Generator. You could take the resulting image and location information and run it through a separate sprite sheet editor to pull the images out. Then resize them to the widest character and put them back.
Though, you're best bet is to find an alternative font generator. This isn't really the place to ask for that however. Though I recommend your search term be something like "fixed width bmp font generator", which had some results for me.