>>> So you can type C-α C-α Foopkg RET, then C-α gives you the Foopkg 
>>> bindings.
>>
>> I'm not sure I understand what you mean.  Would this mean that each 
>> time you want to use, say, Org-mode you would have to C-α C-α org-mode 
>> RET before typing C-α c?  If so, I don't think this would work.
>
> Org is a collection of major modes, so I don't think it should need to 
> use the C-α mechanism.  That mechanism would be meant for packages that 
> need to define a binding for a global prefix key.  Major modes can 
> simply define local bindings.
>

Org is indeed a collection of major modes, but three of its commands are 
meant to be bound to global bindings: org-capture, org-agenda, and 
org-store-link.  These commands are intended to be called from anywhere 
else, say from Rmail.  For example, org-capture is similar to (and derived 
from) M-x remember, it lets you store notes without interrupting your work 
flow: while reading a mail in Rmail you can select a part of its text and 
call org-capture, the text you selected will be copied to a new note, you 
can add other information to the note, and the result will be stored in 
your "notes.org" file.