Did A5 still support WDL in the first versions?
What exactly do you mean? WDL (C-Script) is the basic language of GameStudio but has been changed often. And some years ago renamed to Lite-C, because it became a lot more system and c(++) related - made it much more flexible and powerful!
In conitecs words:
C-Script was the standard script language of Gamestudio up until 2007. It was developed into a new script language, lite-C, in 2007. Lite-C is extremely similar to C-Script - in fact you won't see a difference at a first glance. However at a second glance it offers a lot more possibilities.