Allow users to create automatically numbered outlines in the traditional academic format as follows:

I.
A.
1.
a)
(1)
(a)
(i)
(a)
(i)

Add the possibility to create columns with different types, such as Date, Money, Text, etc...

Allow to select multiple rows. Then perform some operations on them, like moving or just formatting change.

Make it possible for a given outline entry to appear in multiple parts of an outline. Changing it in one place changes it in the others as well. When a clone (or "alias") is created, it includes any associated "children".

Allow for the creation of smart folders that would collect outline entries meeting certain criteria. Questions may arise about whether the "parents" and "children" of a given entry should be displayed as well. I would propose that the default mode should be that only the actual line meeting the search criteria be displayed, but that there be some sort of indicator showing that the line has parents and/or children. Clicking the indicator would then display those parents/children. Thanks!

Importing from OmniOutliner support

Add the possibility to create template documents and then allow to create a new document from template.

Template for example can have styles defined, or even text entered (for example for monthly expenses, etc...)

Use drag and drop or import feature in order to attach shortcuts to document files, entire project folders, and/or URLs for launching programs, documents and websites.

Currently it is possible to specify only foreground text color. But it also useful to specify a background color of the entire row.

Show checkboxes for selected rows only.

Like in OneNote. Make it possible to add tags (both symbols and words would be great) to individual lines, and then have search folders that collect items with certain tags.

To avoid loss of data backup current document every N minutes. Also autosave 'untitled' documents

Any way that images and pictures could be supported?

this will enable, for example, a "Due Date" column to sort and show what Tasks might be due. OR would enable the creation of a GTD context-like column where all like contexts could be sorted for review and execution, etc, etc.

Make it more responsive. Especially typing should happen without noticable slow-down.

Don't know if that is possible: on Mac OS the OmniOutliner allows multiple open files. OO remembers on exit which files were open and reopens them when starting.