What is lacking is a more complete musical timing language. Time signatures and conductor-specified fermatas and accelerandos are not sufficient. Any good orator knows that the emotional impact of a sentence can be ruined by either pausing for too long a time or for too short a time - and that is just to mention pauses!
The composer is always first to imagine new music. Today, a composer can specify a piece of music with a mouse and a sound-enabled computer instead of a pencil and an orchestra. I recommend Finale software for this purpose. Unusual timing remains the musical feature most difficult to specify. If a speaker's timing or any new musical timing is to be further developed, it will begin with more complete and convenient timing notation incorporated in music software. Then, it will be written.