For example text selection with shift+arrow keys seems to be implemented (#979) and works for me in at least XTerm when in inline mode in addition to just the full screen mode.
However, it doesn't seem to in Konsole when not in the full screen mode. Konsole has its own keybindings for shift+arrow keys, but disabling what it allowed me to (shift+left and shift+right) didn't help. In the full screen mode the shift utilizing bindings work (and for example in Nano as well). Is there some kind of an inherent limitation to the inline mode from which this issue arises? If not, then please fix.