Some misc ideas for expanding on pistons

-iron bars connect to each other, but only horizontally. longer range than slime
-fences connect to each other both vertically and horizontally. they dont connect to different fences
-rails that get pushed move any minecarts on top of them

I've tried messing with the piston code before and it really is a jumbly mess. Also editing it with mixins isn't that easy since there are other mods that alter it to move tile entities like quark. The only one of those that I might be able to pull off is the minecart one but I wonder if that wouldn't take away something from the game. I mean if one would want that functionality honey block could be used on its underside (assuming that that works)