How to change assignee from the board sidebar?

[Luke McCarthy]

It would be useful to change the assignee from the issue details sidebar however this section only gives a read-only view. We are required to edit the ticket in order to change the assignee (and the priority too). Is there a fix that can change this option? 

Thanks!

Screen Shot 2016-05-02 at 1.55.47 PM.png

[Adam Abrahami]

100% why hasn't this been addressed in 4 years?

[Daniel Kollmann]

Considering that assigning issues is a big part of planning this is ridiculously complicated. I should be able to select multiple cards, right-click and say "Assign cards to user".