Hi again Poppy,
I’m sad to say that currently no work-around in possible for your slider question issue. I will fix the problem when I release v17, and will try to do that as soon as possible. I’ll make sure to issue another bug report to Qualtrics about the issue, as it’s not just Slider questions that are affected, but also Heatmaps and hot spot questions.
As for your other issue, I have added an entry to the FAQ to explain a work-around for it. It involves adding your own NextButton and then making it call QRTE.proceed. Please take a look here (down at the bottom):
As I said, this is an issue that will be encountered by many more people, so I’ll add something to v17 so that you can easily add your own button. Perhaps make it another ‘EndAction’ option.