In order to make schedule more readable, I suggest the ability to separate row groups after apply filter with different line pattern than the rest of the cells.
The idea is to have someting similar to this:
instead of:
And customize the line stile / line stroke pattern in for each level of groping should be made in Appearence tab of the schedule. There you edit the pattern for first, second, third and fourth group or let all be the same. (But I will love is schedule have more than four levels of grouping, five at least but better to have no limit at all).
There is another simple schedule improvement that could make much impact: Grouping Rows
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