Make the sites blocker tool accessible from focus mode (so I can add websites to the block list for instance.

Hi Vincent, thank you for your suggestion! You can definitely access site blocker on Focus mode.
To make sure it’s enabled:
Open Momentum > Go to Focus mode> Make sure site blocker is toggled on
If you’re having trouble, just let us know and we’ll walk you through it. 💛You may also raise a ticket using this link https://get.momentumdash.help/hc/en-us/requests/new