With -show_err on I've caught alot more errors than with M:TW. With M:TW I largely depended on my experience and when the CTD occurred then depending on the few (inaccurate) dialog boxes.

Movement is still moddable but on a different level. It's now in the animation and that is alot more logical if you think about it.

M:TW was simpler and of course that makes it easier to mod.

I now prefer R:TW since we are almost capable of changing everything what was possible in M:TW and a lot more. If only we are able to add factions....