Re: 92 hour transit visa at Dubai airport..
Well, it is impossible without the hotel reservation fax confirmation.
I got the confirmation before traveling without paying anything to hotel. When I entered Dubai, I hired a cab and went straight to my friend. No problems. Fax copy is just a RED TAPE for Pakistani passport holders.
OR
You can ask relatives in Sharjah to sponsor his visa. It takes just 2-3 days.