I find it daunting at times to search for an activity in the task layout. Why not a quick search text box that could do a quick search of a task based on a word in the task or detail? It would be a keyword search only on tasks.
Hey, why not the same for histories or notes in the bar specfic to notes or histories right where the task bar is near the tab?
I am aware that there is one available in the lookup option at the top menu, but this could make it easier if all you needed was a keyword and it's already focused on what one is looking for.