Tosh, is that not a bit of a headache? especially at this time of year. I am forever placing the pole up against a wall or whatever so I can go and move garden furniture stuff on loads of jobs or maybe just to have a chat with someone. This idea of your's sounds well daft to me, water would be gushing out all the time whenever I stopped for any given reason.
Nope; it's not a problem. Wor Lass can do it no problem, and she's just a little woman. Trust me, if it was difficult, she wouldn't do it. She prefers the SLX without the aqua dapter and using an external pole hose; she finds it easier.
It's only a bit of nipped hose; you can talk to a customer while holding a bit of pole hose surely (I know you're a Jock and this will probably be considered multi tasking)! And if for some reason you did need to use both hands, you can disconnect the yellow hose from the pole hose and the rectus connection stops the flow of water.
Maybe this is a personal preference thing, but you're all welcome to spend £70 on an overpriced lump of weight at the end of your pole that'll possibly give you problems; but I know what I prefer. And both Ian_Giles and Squeaky work with external pole hose too; so we can't
all be daft in Chepstow!
Can we?