2.8, Is Key Free addon bug?

What is Bevel Modal Map? It has multiple keybinding shortcuts, according to Is Key Free search. There is a lot of shortcuts belong to Bevel Modal Map, below is just a few examples.

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Bevel operator is a modal operator. It means that when you call the operator, you enter into a mode where options can be activated through shortcut.
In edit mode, you call Bevel by pressing Ctrl B.
Then, you can change mode by pressing M, increase amount of segments by pressing S, go back to width modification by pressing A, change profile by pressing P, etc… and eventually confirm by pressing Enter/left click or cancel by pressing Esc/right click.
Those last shortcuts mentioned are corresponding to this Bevel Modal Keymap.

Lots of operators have a modal keymap. A modal keymap for tool options like knife or bevel.
Or a modal keymap to switch to another operator like transforms (when you start a move, you can switch to rotate or scale by pressing R or S without canceling move action).