In one of the latest versions of InDesign, endnotes have undergone a significant upgrade as they have become live endnotes than static endnotes. But unfortunately, the footnotes are left far behind.
We really ask that you rewrite the footnote feature so that the following features are possible:
1) Select all the footnotes at once (by Cmd + A or Ctrl + A)
2) Option to split footnotes into a number of columns is different from the main text (not just span footnotes but complete control over the number of columns)
3) Continuous footnotes in the same paragraph (run-in).
4) Possibility to add any decoration or title to the footnotes (and not just the 'Rule above')
5) Option for a different position of the footnotes on the page, and not just at the bottom (side notes)
6) Possibility to control the footnote settings for each story individually.

Logging this as a new feature, but it could also be a bug? Also logging this under "EPUB" since thats most important to me, but it also affects "HTML"

Currently the only space characters exported by InDesign are the regular space and the non breaking space. All others are converted to regular spaces on export. These spaces should be retained in the epub, since they are supported by reading systems and in many cases it is typographically incorrect to use regular spaces.

Spaces with direct Unicode mappings:
Normal Space U+0020
Nonbreaking Space U+00A0

Em Space U+2003
En Space U+2002
Third Space U+2004
Quarter Space U+2005
Sixth Space U+2006
Thin Space U+2009
Hair Space U+200A
Punctuation Space U+2008
Figure Space U+2007

InDesign custom spaces without unicode mappings:
Nonbreaking Space (fixed width) N/A (should be mapped to U+00A0, regular non-breaking space)
Flush Space N/A (this one is OK mapped to regular space)

I have full example files, but InDesign user voice doesn't accept InDesign files as attachments, nor zip, HTML, or epub. Attached HTML saved as text.

InDesign should apply what ever it recives from the PDF. The formating options for the comments are pretty limited – Bold, Italic, Underline, ...

If I accept a comment that has italic characters, the formatted text would be [italic].

If I accept a comment that has bold characters, the formatted text would be [bold].

If I accept a comment that has bold italic characters, the formatted text would be [bold italic].

If I am using a font that does not have an Italic weight (Maybe it uses Regualre Italic), the text would just recive the standart missing font warning (The pink highlight).

This is a point which was subject of lot of discussion since years in several forums. Even this uservoice mentions it (partly) sometime but obviously it hasn't been considered at all.
In InDesign, a footnote can't contain xml structures.
In InDesign, it is not possible to map an xml element to the footnote object.
This is really weird, since:
a) mapping XML element to an InDesign object is something exiting already for tables thanks to attribute aid:table. So why not having set an attribute aid:note, with values "footnote" and "endnote" and implementing this?
b) footnotes and endnotes can contain by nature various content such lists, tables, references, etc. which are, in the scope of a XML publishing workflow, subject to specific tagging. In other words, allowing tags in these contents is really a must have. Again in table cells - which are a specific object too, xml tagging is allowed.

That point plus the lack of management of mathml, is seriously blocking the use of InDesign in the scope of structured content workflow.
Which is a pity since in the meantime Framemaker - done for structured content - has itself serious lack in its rendering capabilities.

The only way to adjust the UI size in Indesign is to change the scaling for your whole system, and even then it only supports up to 200% scaling and there is no way to make it bigger beyond that.

I got a new laptop with a HD 4k screen and its already scaled to 250% (I'm using Windows 10) but the user interface is still too small and it really slows down my workflow. Even if increasing my OS scaling to 300%+ fixed it (which it doesn't), it would still be infuriating to have everything on my computer scaled that high all the time, or have to adjust it every time I wanted to use the program. You shouldn't have to change the scaling for your entire system to make this program usable.

I just don't understand why a professional-grade product doesn't account for high-resolution screens, or even include a simple in-program UI scaling slider or option.