Numbered lists and custom numbering (out of order numbering)

The numbered lists are very useful to keep track of minor discussion points. However it's not possible today (as far as I understand) to make a custom numbered list with certain specific numbers.

Example

A developer gives me 7 reasons in a numbered list for why my feature proposal is a bad idea.
I (or someone else) might want to respond by referencing his arguments/points with something like

1. Good point, but ...
3. I don't agree, ...
7. Fair point, ...

However this yields the output

1. Good point, but ...
2. I don't agree, ...
3. Fair point, ...