Hi,
In reply to your questions:
1. No, it is not possible to set a custom number of passes.
2. Currently, It does not have denoising implemented because this benchmark is from Corona 1.3, and denoising was implemented in 1.4
3. We want to implement a new benchmark at some point but at present, we don't have this planned but in case this changes, we will notify you.
Regards,
Avi