A simple mod which remove the summoning limit cap :
http://www.terrender.com/_mods/bgee/remove_summoning_limit_cap.zip
Extract "summlimt.2da" from the zip and copy to your "Baldur's Gate Enhanced Edition\Data\00766\override" folder. Create "override" folder if it doesn't exist.
BGEE with patch 1.2 needed.
Remove Summoning Cap for Celestials too.
Enjoy
http://www.terrender.com/_mods/bgee/remove_summoning_limit_cap.zip
Extract "summlimt.2da" from the zip and copy to your "Baldur's Gate Enhanced Edition\Data\00766\override" folder. Create "override" folder if it doesn't exist.
BGEE with patch 1.2 needed.
Remove Summoning Cap for Celestials too.
Enjoy