For the first question: Options -> Display -> Report columns -> Uncheck "SlideNum"
Second: The heuristic is already configured to give the higher score to executables. BUT you have to take in account various considerations. First, FARR only searches in what I would call "user directories", that is, those directories that an user handles and uses in a daily fashion, like My Documents, Desktop, the Start Menu, etc.
So, to launch Photoshop, you need to have a link for the application (or the application) in some of these directories. It seems this is not the case, so you have either to create this link, or include in the "Search folders" section the directory in which Photoshop it's installed (I suppose it's Program Files, which comes included in the list, but disabled by default. Also, I don't know if the executable for Photoshop is called like you say, or has another name (since I don't use that program).
I ignore which is the range of scoring, but I suppose it's between -9999 and +9999.