Seriously, daft idea. SS is *most* annoying DH! On climbs you can just mash a big gear and go faster, going DH you spin out and it's irritating. Above a certain speed you have no resistance to kick the pedals to control the bike etc, if that makes sense.
That's bollox mate, for a start, above a certain speed you don't "kick the pedals to control the bike" - you just need to shift your weight!
I very rarely change gear at any DH track anymore and TBH a very small section of motorway at Ft William motorway is the only section of any track I've ridden in years that I actually need to change a gear to clear a couple of jumps on. better riders than me can make them chainless.
I'd love a SS DH bike but would not want one with a tensioner as (and I may have said this elsewhere recently
) I reckon to run a flawless SS set-up on a DH bike you'd still need some amount of chain device up front and possibly a couple of guide plates either side of the sprocket. to achieve a completely taught chain through a rear tensioner alone would need a very stiff tension spring and I'm not even sure most mech hangers are beefy enough.. I'd also imagine the amount of tension needed to keep a chain taught on a DH bike would not be too good for the life of other components. I think SS in principal would work great for me but just can't see a completely reliable set-up being simple (or even very light) unless you have a frame design that lends itself to SS well (URT, Concentric BB pivot or jackshaft)
find an old Mr Big ST-10 and SS that