Hi. What about improve the functionality of Reverb, such as: Tempo sync, Diffusion types(Plate, Hall, Room, Shimmer etc.)
Definitely would love additional algorithms, personally I think a reverse reverb would be really fun for sound design
The size knob will lend itself to a Room to Hall type vibe though in the mean time if you need it
If you wanna get technical you could probably recreate some early reflection type effect with the delay!