Limit by number of activity entries instead of number of days.
When I am trying to browse the activity of a certain project or person, I am often in a situation to go through a lot of blank pages until I find some entries. This is very tedious and time consuming.
The option "Administration->Settings->Days displayed on project activity" is set to 30 days. If I increase it, then when looking at the activity of all projects (or some big projects), the page is flooded with a lot of entries and it takes more time until it is populated.
A possible solution is to add "Max entries displayed on activity page" option. Or to have it controlled on the activity page that lets the user break pages by certain number of days or entries.
Related to #15129, but that other request mentions a different problem.