It would be nice to add labels quicker. If the labels is in the right click context menu it works fine but if not you need 3-4 clicks.

How about you build a quick search. If I select a time frame in the top and start tipping there could be a quick search / autocomplete. You would click one time, type the label name and press enter. Done!

That little thing would make your tool 10 times better.

Greetings
Philipp