I know, you can do it. But right now it isn't done I wish it did. That would be a great way to introduce units unhorsed and still fight (A classic theme).

If a mod comes out and when the tools work, I'd love to see all cavalry work akin to the Hunter Spiders with either riderless war horses, or dismounted riders

Things that use Javalins in my mind are not using missile weapons per say, because in order to use a Javalin you have to close. Unless there is some big javalins out there with more than 2 rounds of range.