Goalie stats 

Template:Infobox football biography 2 states quite clearly that the "(Gls)" stands for goals that the player has been awarded in league competition only for each professional club. There are goalies with quite a substantial number of goals, for example Hans-Jörg Butt, so the numbers are not always zero. 

There are no different infoboxes for goalkeepers and other players and the consensus at WP:FOOTY is (as far as I know) to treat them in the same way.
If you want to change this, please start a discussion at WT:FOOTY. One reason why I would not like to list the goals a goalkeeper allowed is that this information might not be available for most of the goalies.