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The simplest solution is selecting the control on clicking on it: process OnMouseDown of controls, and call RichViewEdit.SelectControl() in it.
See the example in viewtopic.php?t=157 (how to resize and drag&drop controls in the editor).

AutoComplete property for these combo boxes is False by default, intentionally.
Each time when autocomplete works, the font is applied, adding a new item to RVStyle.TextStyles (if there is no existing items with these properties).
While these items will be removed after the next call of ...

The demo uses a workaround,

const
WM_DESELECTCOMBO = WM_USER + 1;

In the form's interface section:

procedure WMDeselectCombo(var Msg: TMessage); message WM_DESELECTCOMBO;
procedure DeselectComboBoxes;

Implementation:

procedure TForm3.DeselectComboBoxes;
begin
cmbFontSize.SelLength := 0 ...

TCustomRichViewEdit has a method for processing Backspace:
procedure OnBackSpacePress(Ctrl: Boolean);
But this method is protected.
You can try to call it in this way:

type
TCustomRichViewEditHack = class (TCustomRichViewEdit)
end;
...
TCustomRichViewEditHack(RichViewEdit1.TopLevelEditor ...

The correct event is OnJump
The help topic has an example code how to get a target of the clicked link (assuming that this target is stored in the item's tag).

PS: there is no OnRVHyperlink event. There is OnReadHyperlink event that occurs when reading hyperlinks from RTF, DocX, HTML, or Markdown ...

Sorry, not supported yet.

In VCL version, you can use SendMessage:

SendMessage(RichViewEdit1.TopLevelEditor.Handle, WM_KEYDOWN, VK_BACK, 0)

Sorry, what's "insert key"?

Not all table properties can be saved to RTF.
Use SaveRVFToStream and LoadRVFToStream.

That topic is on the protected forum, accessible for registered TRichView users.

In TRichView, a bookmark" does not have lengths, it marks a single place in a document.
I plan to implement lengths for bookmarks (most probably, by grouping them in pairs of starting and ending marks), but not in the near future, sorry.

The same for changes discussed in the referred topic.

1. Sorry, but I cannot reproduce this problem with the mouse cursor.
I checked the demo in TRichView\Demos\Editors\Editor 1\

It has Screen.Cursor := crHourglass before loading, and Screen.Cursor := crDefault; after.
(the call of RichViewEdit1.Format is after restoring the cursor; it's not good, you ...

Assign RichView.RTFReadProperties.BasePathLinks = False.

No event occurs after loading RTF file.
OnLoadDocument occurs when loading a document from DB via LiveBindings.
Even if this event existed, nothing would be changed.

Maybe it will work if you remove Application.ProcessMessages?

The default property values are not optimal for RTF reading.
Unfortunately, they cannot be changed because of possible compatibility problems. Instead, optimal property values are assigned when the component is placed on a form at desigtime.
Assign
MyRichView.RTFReadProperties.TextStyleMode ...