No additional setup is required- so you can simply get back into the mix and go on as nothing happend.
As a TouchOSC-User and a Lemur-owner I have to say the switch was rather drastic. The TouchOSC is just a controller-surface, the Lemur allows you to build scripts (more like programs) including elements like "multi-balls", which are multiple XY-Pads combined with a physics engine. Faders are working in physics mode as well, so that you can flick the and they keep running based on adjustable friction-levels. And thats just scratching the surface and needing a few minutes like configuring the traktor.
The price is steep, but you my as well get lucky on craigslist/ebay.
I would go so far as to say the only thing I wouldn't recommend the lemur for is beatjuggeling, as I grew attached to the rubbery feel of pads. Tapping on the lemur is possible, but I just need the click there.