i dont think caps gets your point across any further. i dont see how light movers would make more room either, having to buy a system or rail would end up taking up more space than the average hanging light, not a hanging light attached to a rail to move, the installation would be a pain in the ass also. i would say yea thats all your going for really is bragging rights that you spend a shit load of money for a minimal increase in yield.
there is something cheaper called trimming, topping and LST.
i also dont see how having lights hanging from a railed system to move would give you more plants? or space? the floor area would stay the same, if anything they will give you less height to work with even if your telling me you have lights sliding around on your walls also, not just the roof which is absurd, even then that would take up more space from your floor area. so i dont get the whole more space and more plants thing, sorry.