It isn't possible to disable the Custom Lists feature - you'd have to delete your lists in order to prevent them from being used.
If you just want to fill sequential numbers or similar sequences you might try using Flash Fill instead of a regular fill.
You can see more about Flash Fill in: Expert Skills Lesson 2-21 Use Flash Fill to solve common problems.
If you just want to fill without adjusting items, you can do this by holding down the <Ctrl> key.
You can see this in action in: Essential Skills Lesson 2-14 Use AutoFill for text and numeric series.
We don't currently have any video lessons for Excel 2016. The reason for this is that Microsoft are now releasing major updates to Excel 2016 every 6 months, making it impractical to re-record every video lesson for each new release. Instead we are releasing a new e-book version of our course every 6 months. You can find out more here.
I hope you're able to find the solution you need, but please feel free to reply if you need any more help with this. If you could give an example of the problem I might be able to come up with a better solution.
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