Assign Ctrl+Alt+Shift+N hotkey (unless it's used) to this command.
Add Syslinks as in Alt+Q: 01 (set the input's value to this number and close dialog), -1+1 (adjust the value by delta; both with tooltips: Arrow DownArrow Up)
Handle Arrow Up and Down keypresses while the input is focused that increment/decrement the value by 1
0
1
(set the input's value to this number and close dialog),-1
+1
(adjust the value by delta; both with tooltips:Arrow Down
Arrow Up
)342