helpful replies, but which also confirmed my initial thoughts that there's nothing you're supposed to do with the set if you don't want to. That said, Sada did an amazing job adding traces and ropes, so the effort pays dividends if you put your mind to it. I decided that in the end I couldn't really be bothered to spend more time on this set and knew that I'd only make a total hash of it if I tried to add fuse wire or whatever to fill in the traces.
So what you have here is the unaltered Perry set. I'm not sure it really works without anything being connected to the horses (see photo on left), but I imagine it's completely impractical to sculpt and mould anything else. Another minor grips I have is the "advancing rapidly" pose of the set. I suppose in games you do need moving limbers to show guns that are, er, moving. But personally I prefer standing limbers which I can place behind the firing/loading gun models. Then again, I'm not much practised in Napoleonic games and maybe in 25mm there's just no space; in which case moving limbers are probably best.
I thought it would look nice to paint the horse team in the same colours, so they are bays painted with the Foundry "Bay Brown" palette. The colours used for the drivers' tunics were Foundry palette "Confederate Grey 117", while the limber and gun were painted with my usual French Napoleonic artillery green combination: base coat of Vallejo "Yellow Green" mixed with plain black, then first highlight of "Yellow Green" and second highlight of "Yellow Green" mixed equally with Vallejo "Dark Yellow". The whips rather failed me, I'm afraid - I had no idea how to paint them and recall not finding much help via Google.
2 drivers, 4 horses and a limber. Painted January 2013.