[MlMt] Stricter search for Go To Mailbox?

[pleasespamme at posteo.net]

Is there a way to adjust the Go To Mailbox search (command-T) so that it 
only searches for the terms as you type them? For example, if I type 
“My” it is currently showing results for My Inbox along with a 
folder for Maxine Yeates and other such non-consecutive results that 
have the letters m and y. I would rather it only show me the folders 
that have the consecutive letters m and y.