Right now choosing day we got those values : 30, 60,90,180,365,500.

Would be great to add "7" as in a week,

I tried manually changing https://github.com/piwik/piwik/blob/7119a07d7e5bc6416c2f8eeb0823bbea5f840d18/plugins/CoreHome/javascripts/dataTable.js#L476 but it didn't show up even after deleting /tmp/.

Is there a hidden FAQ or setting where I would be able to add such number ?