There are two "lists"...
Filetypes that can be added / controlled by EPDM - ALL
Filetypes that can have variables linked to parameters in the file / automate tasks like printing to pdf, etc using Built In EPDM functionallty - Limited to Solidworks, Microsoft Office.
Of course, with a little effort then you can link variables in other filetypes and automate tasks but you have to start adding functionality through the API.
I woudl say that yes you are crazy, crazy like a fox! if you are a small company and have fairly simple process mangement then i could see ways of getting done what you want. it will take some programing help from your VAR or other sources but I think its a great idea. my company is too big and too engrained with our current MRP. good luck though!