When setting the new "Use variable hotkey (Advanced)" option, key combination values from the static "Press a key or key combination for this command" section are saved and displayed in the command list of the "Edit a Profile" window's "Shortcut" column.
They do not affect the actual command hotkey, which will still be derived from the entered variable, as intended.
The "Shortcut" field currently remains empty if the static section is not used; Displaying the variable name, or at least an indication that the command has a variable hotkey trigger, in the command list would be handy.
EDIT: Fixed in v1.7.2.29