Quad centre
E.g.
left aligned text centre aligned text right aligned text

Presently, you can do:
left aligned text right aligned text
but not centered text in the middle

There are various work-arounds to do this now but all are clumsy.
WordPerfect has done this for at least 35 years.

When placing an object in flow text, for instance a small image, the object can be shifted up and down with the mouse pointer to adjust its position in relation to the text. That position is nothing that has a corresponding value in any toolbar so it can't be reset. Would be nice to have a reset button for it or use the text shift up/down value also for objects.

Make it possible to insert character formatting (italics, superscript, character style sheets) within the tag for the index.

the comma always moves at the wrong position than placed.
see this video where i describe the problem

In the paragraph border options we can set the top edge, bottom edge and width to text based parameters but it would be useful to be able to set these to align to the text frame edge.

Especially useful when running multiple text frames up against one another in a loosely tabular format but when you don't actually want to be bound by the restrictions of a table.

There should be way to capture styling information from an image. It will be helpful to find out and use the font and other kind of text styling used in an image.
This way I'll be able to save information from an inspirational image for later use in my design.

Would be extremely useful if you could automatically add a condition by applying a paragraph or character style (via data merge or an external Data Management System) to text without having to do a GREP find/change. Would make producing different versions more practical.

If you have a text frame with multiple columns and the footnotes split into columns, the column rules do not continue in the footnotes.

I'd like to be able to quickly adjust the left, right, first and last line indents of my paragraph using a Quick Apply or a custom keyboard shortcut.

I find it strange that it doesn't already exist, given the countless other basic adjustments available in the shortcuts panel.

We need smart title case, with prepositions and conjunctions not capitalized. It's ridiculous that a script or third-party plug-in is required. This is a publishing program! InDesign can create a table of contents—it should be able to do it correctly.

I have cliënts that make comments in PDF. In these comments they add (or replace) text using the correct comment tools. But very often some of the added text needs to be Italic or Bold or ... So they use the Text Style feature in Acrobat to italicize certain words.
But when importing PDF comments, these text styles do not show in InDesign. It would be great if this feature could be added.

I am working with lot of icons and queries. While doing correction there are many objects should get delete, For that clicking every object and pressing delete button in keyboard takes more time. Instead if it is one dedicated tool is there so that I can click that tool when tool touches the object it delete the object without pressing delete button in keyboard. This option should work well even with anchored objects.

While I know this can be achieved by creating a thick rule and offsetting it just right, the ability to highlight text with 1 click (like the underline button) would be a time saver.

A feature long missing is the ability to select non continuous words within a text block. It seems like such an obvious need to me.

Ie in the above text, I want to format the words - long, select, such and me - to be inbound or a different size, or caps. Unless I am mistaken, this would need to be done individually. Just like you can easily do in WORD!!!!!

Find searches for anything that is NOT the term. eg. Find NOT 12 pt will select text that is not 12pt

I highly recommend that Adobe updates a feature to delete all unused paragraph styles in one fell swoop instead of a file by file case.