Setting values on issue when changing status

PEtter Ekrann

When dragging the Issue into the "under development" state I want to set the Assigned To field to the user moving the issue.. 

Probably an easy thing, but can't find it. 

 

I would also like to update a custom field to the current date, this date should not change even if the item is set to the same status again.. 

PEtter Ekrann

The one that search will find  

This was under rules on the board ... 

Except the fact that the custom filed will update every time i drag it to given col-.