thank for asking about the new HotPot module.
I was hoping it would be ready by April but that didn't work out. I did a lot of planning and made a start on the programming, but wasn't able to get to a point where I could offer it to people for testing.
Right now, I am in the middle of a busy university term - teaching classes, looking after students and applying for grants It doesn't look like I will be able to pick on the programming till the summer now.
We have a few National holidays coming up in Japan, which are collectively know as the Golden Week. During that time I will be working on ensuring the current HotPot module works as intended with HP 6.2. In particular I am concerned about the "ignored" values. If possible, I will also put some effort into investigating the reports of the Moodle mp3 player not passing on event information through the DOM as it should.
Anyway, getting back to your problem with adding many HotPots at once. Are you aware that you can add several (many!) Hotpots to the same section of the course with a few clicks, if you put them all in a single folder and specify the folder name in the "File name" field on the "Add a new Hot Potatoes quiz" page and set "Add Quiz Chain" to "Yes". Have you tried that?