If I had a wish, for me it's how the denoiser workflow is implemented:
1. Let us denoise *during* a final render, with whatever the denoiser is set to. I'd love to see if the noise level is good enough while i'm rendering. Sometimes I'll set way too many passes and having a way to preview the denoiser without stopping/cancelling the render would be great.
2. Currently, a denoised render will save to the history only if it was a final render, IR will save to history without the denoiser... This is inconsistent and makes it impossible to compare IR vs final renders since you can't save/view the denoised version from IR.
3. Denoiser checkbox in the VFB is inconsistent - for final rendering it will work only after a render is stopped/finished. For IR it can't be disabled without re-rendering (and has no function there), plus, it has to be disabled in a different place. It just doesn't do what it implies the way it's designed now.
For me it's the small things and consistency between final/IR rendering is not where it should/could be wrt to denoising.