Couple Activity Filter across all Graphs in "Compare"

In the Compare menu, you can set an activities filter on each graph. The idea here would be to make this a top level filter (near the date / period) so that all graphs relate to the same activity types.

Here the screenshot shows it on efficiency factor, but this only applies to this graph not all graphs in the Compare area.

I have graphs specific for Cycling and others for Running. Why would I want a top level filter?

I have lots of graphs on the Compare menu, for me all those graphs apply to the same set of data. e.g. same date ranges, same activity types. Maybe a better implementation would be based on Tabs like in the Fitness menu.