When number of activities are filling more than the entire pane, probably whatever work I need to do on the tasks, f.ex. to look at or edit some of the tasks at the next page, the pane automatically scrolls back to the top, while I still have work to do at the bottom of the task list. Then I need to scroll down manually. Thats very annoying when you have a lot of work to do down there and need to scroll all the time.

You should check if this is a general design feature applied to all screens in the system.