KMail from HEAD currently has three alternative implementations for 
selecting recipients in the composer:

1) The classical editor with one line edit per recipients type 
(to/cc/bcc) and the old clumsy selection dialog with the two 
hierarchical lists. This is enabled by default.

2) The new addressee selector dialog which also uses one line edit per 
recipients type, but uses a more streamlined selection dialog, still 
with two columns. This can be enabled by putting the line 
"AddresseeSelectorType=0" in the "Composer" section of kmailrc.

3) The new recipients editor which uses one line edit per recipient and 
provides a combo box for choosing the type (to/cc/bcc). It provides a 
one-column recipients picker dialog. It can be enabled by putting the 
line "RecipientsEditorType=1" in the "Composer" section of kmailrc.

I would be interested in feedback about which alternative is the best. 
Maybe someone could even do some comparative usability tests.

-- 
Cornelius Schumacher <schumacher@kde.org>
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