Kerning Editor (with individual margin alignment options)
A Kerning Editor would fit nicely into the kerning feature, which allows to choose between optical, metrical kerning. The user would define his own kerning names.
The Kerning Editor has a GUI which allows the user to define his own kerning pairs which override the metrical ones defined in the font's kerning tables. There I can load the metrical kerning or the optical kerning as a start for my individual kerning.
Furthermore the new Kerning Editor has two more tokens/glyphs to kern with: the left and the right margin of a text frame. So the user can define his own margin alignment set, separately for every glyph in the font.
Since the EULA's of all font companies are very strict to not alter any part of a purchaced font, it would be very, very useful to manually change the predefined kerning of a font inside an InDesgin document, so you don't have to worry about kerning any more. The optical kerning method is cool, but often enough it provides not the best alternative to the metrical kerning.
Furthermore the optical margin alignment should be better worked out. The user should not depend on an algorithm, but should be able to decide, which glyph goes out how far beyond the textbox border.
(There is a competitive layout program which has this feature since v3.x ...)
Peter Kahrel commented
The ability to create custom kerning tables is an absolute must for InDesign,
Great idea and usefull feature especially for Book- and Editorial-design.