This seems like a nice addon, and will definately be welcome in the new release.
My only question is why you are charging for it??? Doesnt make sense? Its going to be included in the new release anyway? So why try and grab a few extra dollars from you loyal client base in this way? The way I see it, if you want to spread the news that PHP Arcade Script is a great tool with lots of great value added functionality coming on board regularly, then charging for this sort of stuff is not the way to build a loyal fan base?
Just my 2cents though ...