Asked the same 3 weeks ago, no answer so far.
I guess it's simply because this had not been a real issue in the past
before the iPad version was released (which I like very much).
But now, if you use an iPad and a phone, you always need to unpair and
re-pair again, which makes using both tablet and smartphone impossible
in practice.
You can vote for this feature here:
http://mlo.uservoice.com/forums/9235-general/suggestions/2502114-several-profiles-for-wifi-sync
-- Christoph