-Expanded what can be joined and dragged
I have now modified the way a number of things can be drawn so that they work the same way as columns, ground and water etc.
This includes ladders, platforms and spikes. You can therefore draw a ladder, then move it by right clicking and dragging the centre.. or resize it if you grab the ends.
I'm not sure if this has broken anything so let me know if it has, but I have tested it and it seems ok.