Labels with values
If labels would support an additional value, with a syntax like @wip(10%) or @delegated(alex) or @waiting(todoist), then quite a few of existing feature requests would be addressed and it open doors to more interesting ideas.
Searches could be enhanced to support:
1. exact matches (@delegated(alex))
2. number comparisons (@wip > 10)
Note: This is not a new idea, but something I've got used while using TaskPaper.
In case you are wondering how I'm using this:
2. tracking delegated/waiting for tasks
3. estimating/tracking time