Merge Cases in Queue Item List View

I am looking for a way to merge a Cases in the queue Item view, as well as in the Case List view using the merge button. 

It is possible to get a Merge Button in the Queue Item View ?

my customer only wants to work via the queue Item View and not switch to the Case View for merging. 

I hope someone has an idea how I can solve this

thanks and best regards

Sascha