Problem: I would like to let my site visitors filter a View by date, using checkboxes "Past", "Future", and "All".
Solution: Toolset offers a date range filter, but the input fields represent start and end dates. You could use this date range filter to accomplish a similar task, or you could use multiple Views with Query Filters applied.
Problem: I would like to be able to display and edit custom field values in the Post Relationship editor when selecting a parent post.
Solution: This is not possible in the current system, but the new beta plugins offer repeating field groups and some other new relationship features that might help.