RTST can track mouse click and keypress events and alter overlays based on that, but there's no easy or simple way to get real dynamic elements like that. The whole overlay refreshes when you change things and it loads it all as a static image. There is also no elegant way of knowing what weapon you have equipped except for last kill, which isn't the best solution. You could maybe hack something together that works sometimes, but it'd take time that I don't have at the moment, regrettably.