newRPL: custom menu format

[Claudio L.]

The old CST menu format was simply a list of items:
{ a b c }
Then, each item could be a list with two fields:
{ { a.display a.action } { b.display b.action } { c.display c.action } }
And in turn, the action field could be a list of 3 different actions (normal, left-shifted and right-shifted).
I think, without breaking compatibility, that we can have each item be:
{ a.display a.action a.help } to add pop-up help to each item.

Anything else that we could add?
How could we activate that help from the keyboard?