Bug 505022

I recently switched to ktimetracker and it basically solves my needs, so thanks for the great work.

Using it I'm editing the History now and then, e.g. when I forgot to start a task, or when the desktop switcher (witch is a great feature) generates too many short entries. 

So I would love to have 
1. a additional column in the History Editor showing the calculated time for every entry
2. the possibility to change the task on the entry 
3. see the parent name of every task
4. have a keyboard shortcut to open the History editor

Perhaps someone has the time to look int it, unfortunatelly I have no experience in C++

Best regards,