New question on address list in compose window

[Jack <ostroffjh sbcglobal net>]

I know some things about the gtk3 version of the recipient list have  
been discussed, but I don't recall any mention of whether it would be  
possible (and reasonable) to allow vertical expansion of that widget.   
Right now, I get just under three lines displayed.  If I am doing a  
Reply-all, and want to trim some of the addresses near the top of the  
list, I have to scroll up for each address, as after deletion of one,  
it again displays the bottom of the list.  Could a pane split be put  
between the recipients and subject?  Would it work?

Thanks for any thoughts.

Jack