I don't believe so. However, I thought that as the trend to larger batteries caught on, then so too would larger on-board chargers across all brands of cars. That was one reason I went with the 80 amp J1772 stations... to future-proof. But even Tesla seems to be backing away from this. Smaller single charger on the X and a de-emphasis on the dual charger option on the S.
Funny, I did the same thing by installing a 32A J1772 charging station. At the time, most of the ones you could buy were 16A. I think there may have been some higher amp ones, but they were prohibitively expensive. The 32A charger I installed I considered a good deal at about $900 (hardware only, not including installation).
It's nice if someone with a range extender yields to someone without, but it's very situational. You can't ask people not to plug in because they have a range extender, on the off chance someone with a pure BEV will arrive and need a charge. Think of someone buying an i3 -- if they opt to pay more to have the range extender, should they have to drive more often on gas if they do? I don't think so.
Of course it is considerate to yield a space to a pure EV if the situation arises. Sometimes, though, hogging a space may not be intentional. Other times, yes it might just be an inconsiderate person. Hard to say which is which by looking at a car. But I don't think it's a valid stereotype to put extra blame on Volt drivers as falling into the inconsiderate category.