Current behaviour derives from 'V A' rule, which has been around a long
time and is unlikely to go anywhere. Adding an 'A V A' rule with higher
precedence would be confusing and inconsistent.
Solving your problem does not require any new rules, only new
primitives. Arbitrary monadic forks can be constructed using hook (rh;
u rh v ←→ u v), and 'left hook' (lh; u lh v ←→ (u~ v)~). (In fact, a
related pair of primitives would probably be more useful, but hooks are
easier to define using extant primitives and rules.)
Then your (Adv vrb Adv) can be written as: vrb lh Adv rh Adv.
More interesting would be to find a way to avoid writing 'Adv' twice. We
have a way to avoid writing nouns twice, that is the fork; we have a way
to avoid writing verbs twice, that is the modifier; but there is no way to
write a higher-order modifier, so I would be surprised if it were
possible to do so tacitly.
-E
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