Setting Baseline File as a Parameter

I want to know if it is possible to set a parameter for a stored baseline file in a File Checkpoint within a keyword test. I am able to set the file that is to be checked as a parameter, but I cannot seem to do the same with a baseline file (the file being compared to).

 

Also, does the Compare Files operation have the capabilty to visually show you the compared files? I know for the File checkpoint it does this, but it looks like the former operation does not.