And the Syslite Duo does not have a standard tripod socket...
Really? Is it a non-standard thread, or is it also non-standard in some other awkward way?
That does seem a bit of an odd thing to do. I'd considered a Duo, but I'd want to be able to attach it to all sorts of combinations of photographic tripods, booms and contraptions that I already have access to.
With regard to an on/off switch for the Duo, is there any reason - apart from the feeling that perhaps one shouldn't have to, and voiding any warranty of course - one could not (or should not) introduce an in-line switch into the cable?