OT: keyboard deleting of thread Moz Mail?

[Kent West <westk@acu.edu>]

I just discovered that Mozilla Mail can be viewed in "Thread Mode", 
which I like. However, In order to delete sub-messages in a thread I 
have to expand the thread and highlight each message. I did a web search 
and discovered that you can click on the little icon to the left of the 
thread parent which will highlight the entire thread, which can then be 
deleted, but I was wondering if anyone knew of any way to do this via 
the keyboard.

I can hit the right-arrow to expand the thread, and then shift-down to 
select all the messages, but that could be a lot of keyclicks (depending 
on the number of postings in the thread); it'd be nice if I could select 
all the thread messages with just one keystroke.

Thanks!

Kent