Full Arguments is a proposal to merge the and tones (say, into ).
The new tone would turn intransitive verbs into adverbs, and transitive verbs into prepositions:
Sủaq dè súq tì sóaq.
You sing beautifully in the garden.
Here, dè is intransitive so it does not take súq as its complement, but tì is transitive so it takes sóaq as its complement.
Effectively, there is now only one kind of "adverbial", which consumes as many arguments as the verb can still hold (after filling the subject with the event variable) — hence the name.
The difficulty with this proposal is that there are a few verbs which make sense both as adverbs and prepositions, for example ào and ão.