Can DualPipe add support for vpp stage?

[oyanghd]

Current DualPipe Bubble Rate is (pp / 2 − 1)(𝐹&𝐵 + 𝐵 − 3𝑊)
Interleave PP Bubble Rate is m / (m + (pp - 1) / v)
It seems that the bubble rate of the current dualpipe implementation will be higher than that of interleave, because of no support for vpp?
The first question is can the dualpipe approach support vpp without affecting other features such as overleaping etc? If possible, will there be a demo implementation in this repository in the future?
@beginlner