Your way doesn’t work for me.
If the lines are all empty, I have to:
Make a vertical selection.
Type any character instead of Tab.
Undo.
Type Tab.
If the lines are not all empty, I have to:
Make a vertical selection.
Type any character instead of Tab.
Type Tab.
Type Backspace (to delete the character).
(The way mentioned in A works for either case.)
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E:
Ctrl+click to make 2 or more points in the same line.
Use “Increase Line Indent” command.
** The selection positions from the 2nd one are not correct.
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About Issue 1:
I still suggest that it would be better if Tab/Shift+Tab could differ from the “Increase/Decrease Line Indent” commands.
Before the change you made for issue 1, one can do this:
Select lines partially.
Type Tab (and Ctrl+Z).
Now the lines are selected entirely.
This is a quick way to select lines, especially when the lines are long and/or wrapped, and/or one is not willing to operate on the left edge, etc.
The difference extends the use.