Well its not that I skipped JS. I learned PHP/Mysql from a book, which did not teach Javascript in it.
It is indeed planned and will be developed, but not in recent future. Mys v1.3.0 is the top priority right now, as you may have noticed that itemshop will be made available starting from Mys v1.3.0. After Mys v1.3.x series, the Mys v1.4.x will follow with a series of improvement over existing scripts and layouts. The prerequisites for battle system will be developed throughout the course of Mys v1.4.x, such as Stats(such as attack, defense), Moves(such as physical attacks, spells), Elements(such as fire, water) and Status(such as Poisoned, Paralyzed). A battle system is quite complicated, and cannot be accomplished without doing all these prerequisites I've just mentioned.