Restricting the agenda to the current subtree

[Rick Moynihan <rick@calicojack.co.uk>]

I've just discovered that you can restrict the agenda view to the 
current subtree, and I think I'm going to find this very useful!

Firstly is it possible to bind this to a simple key-chord though as I'm 
finding

C-a < < a

A little unwieldy.

Also, how about implementing another "follow" command, that does the 
opposite of following movements in the agenda view and displaying them 
in the file.  i.e. When enabled it uses the org-goto interface to follow 
movements within the file and display the restricted agenda view in 
another window.

This could also be coupled with other queries defined in the agenda yet 
would narrow their focus to the currently browsed subtree.

I'm not sure if it's a crazy idea or not but I think it might be useful.

R.