Currently in Lightning you are limited to a default list of filters for the activity timeline. These don't always make sense to our users. Sometimes we have teams of users working on an Account or interacting with a Contact and being able to narrow down the list of activities would go a long way towards user productivity.
- Rarely do users want to see only emails. Being able to filter OUT emails would be of greater help.
- Being able to sort the list by activity "Type". For instance being able to choose to see only "Meetings".
- Not being limited to four date ranges.
- Being able to see only "my" activities.
Currently the ability to customize the timeline is not available and neither is the code behind it, limiting our ability to do custom development.