that would be a bad idea, even if it is possible. do you want every one of the hundreds upon hundreds of scripts tucked away in your system to suddenly become double-clickable? if you do this kind of thing frequently enough that typing the word 'command' becomes an annoyance, then use and applescript like this that converts the file through drag&drop.

property scriptFileExtensions : {"sh", "pl"} -- insert others as needed

on open theScriptFiles
	tell application "Finder"
		repeat with thisScript in the theScriptFiles
			if name extension of thisScript is in scriptFileExtensions or name extension of thisScript = "" then
				set cmd to "chmod +x " & quoted form of POSIX path of thisScript
				do shell script cmd
				set name extension of thisScript to "command"
			end if
		end repeat
	end tell
end open

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