A postprocessor doesn't really do all that. The CAM program translates your drawing into toolpaths; all the post-processor does is customize the toolpath into G-code that's written for your particular machine. Little things like percentage signs before the program or spaces between commands can make the difference between a program that runs correctly and one that just throws out errors. The "post" makes sure it has everything your machine wants.
VisualMill Standard Edition from Mecsoft would do what you want, and there's a version that plugs into Solidworks. If there isn't already a post for the Crusader, Mecsoft will write one for you for free with your purchase; just send them an example of some code that works on it.