Scheduler - select TimeRange with strg or shift key

Hello,

I want to select a TimeRange with the strg oder shift key. I don't use the solution with the popup to enter a start and end date. I want that the user select the range with the strg oder shift key.

example:
left mouse click on a start date, scroll to the end date, shift key pressed and left mouse click and the complete range is selected between start and end date.

Is that possible?

thanks

kind regards
Markus