Hello Ran,
There have not been any update mostly because everything works same as before, and there were not a lot of new feature requests.

Note that "remembering scroll position" is not something that would my addon do. It only scrolls the page as a direct result of user action (mouse move while scrolling button is down). I think browser should remember scroll position automatically.
Also "zoomed picture" is very unlikely related to this addon.
And over-scrolling is again, something a page should handle (some pages are badly designed with overflowing elements outside the boundaries).

Maybe you have also some other scroll related addons that breaks these?

Best Regards,
Juraj Mäsiar

Hello,
Could you write me to my support email more details?
Mostly, what browser and operating system are you using?
If you are using Linux or Mac, you should get a permission popup when you enable right click scrolling in the settings and you need to approve it.
Best regards,
Juraj Mäsiar

Hello,
Could you send me more info on my support email?
Mostly what Firefox version, addon version and what input device did you used (mouse I suppose?).
Thanks for reporting bugs!

Best regards,
Juraj Mäsiar

Hello,
You can customize scrolling settings in the Options page - by default it simulates scrollbar, if you want constant speed, change it to Grab and Drag style.
Regarding performance - there is not much I can do, complex pages like Facebook or Twitter are too much resource consuming and scrolling won't be that smooth even on fast PC. But there is some special option in the Options page / Advanced / Performance that you could try.

Have a nice weekend :)

Best regards,
Juraj Mäsiar