Sticky throttle / Sticky Choke Part 2

Sorry, I pressed send before I described the problem with the choke on her V30:

We have the increasingly sticky choke to contend with on my wife's V30. When I bought it for her birthday last summer, the guy who sold it to me said that the choke cable needed to be replaced, but he said he'd never messed with it, he just held the choke open with a finger while starting her up and vroom, no problem. We've used that technique successfully thus far, and it works well enough that I can see why the previous owner never bothered to replace the choke cable.

But, I've noticed that the broken cable is not the only problem with the choke. The choke valve at the carb sticks in open position. There seems to be some corrosion at the valve.

In fact, it makes me wonder if the choke cable broke because the choke valve was sticking.

Let's just start with a basic question -- Is it supposed to spring back closed, or is it supposed to have enough friction to stay where I put it?

Thanks for your help, and for your patience with a newbie's questions.

Regards,
Rat