As Dan said I've raced my LWB mid indoors a few times now, compared to the modern 4wd cars it generates grip so goes very well on slippy floor and other such surfaces but on higher grip really is a bit of a handful (although still quicker over a lap than a certain procat
)
Have you got a one-way diff in the front? If not I think one would really help your car hold a tighter line on a track such as that, plus you can trim the line with a bit of brake if it runs wide, they do come up on ebay or here from time to time.