One other thing... what's the real difference between the two modes??? You can still control the engine with the Keyboard. Trying to use the Mouse to control the throttle, brakes, etc. is a real pain in the a** sometimes, at least in my experience.
Using cab mode you get realistic(ish) acceleration and deceleration, tractive effort and responses to it, physics of wheel slip and sanding. DCC mode on the other hand offers a very cut down model of physics and response to controls, most trains will pretty much 'stop on the spot' if you're in DCC mode. The physics rules adds some of those phsyics features to DCC mode, but not all.
But yeah, I use keyboard, can't really stand the mouse for much other than changing view.
I'd like to see Auran expand upon cab mode and offer more mappable controls, since at present it's impossible to model mechanical transmission locomotives properly, you can fudge some aspects using mouse controls and a script, but then you lose the benefits of keyboard controls, and large parts of your locomotive's physics have to be manually scripted. I'm not sure how easy it would be to offer analog and combined-analog throttles, but they'd make modelling UK locomotives (which usually had notches at off and 25%, then a continuous analog sweep to 100% throttle) much more realistic, and it'd put auran's controls ahead of RW again
