Possibility of using right arrow to reach a secondary action/ context menu on tree items

[mbgower]

A team is interested in having a context/overflow menu in a tree, to allow the addition of new folders, deletions, renaming, etc.

Since context menu is not something easily invoked on a mac keyboard, they have been exploring using right arrow to provide access to an overflow menu inside a tree node.

For end nodes, this would seem to be conflict-free, since right arrowing on an end node has no current action.
For a parent node, right arrow has an action. However, right arrow on an open parent node has an action which I would call a redundant action. All it does is move to the first child node of the parent, which can also be accomplished with a down arrow.

I'd like to find out reactions to the model this team is proposing. Currently, the guidance in the APG reads:

Right arrow:
When focus is on a closed node, opens the node; focus does not move.
When focus is on a open node, moves focus to the first child node.
When focus is on an end node, does nothing.

The interaction with their variant would be something like:

Right arrow:
When focus is on a closed node, opens the node; focus does not move.
When focus is on a open node, moves focus to the first child.
When focus is on an end node, moves focus to child, if one exists.

This is somewhat connected to discussions like w3c/aria#1120