The problem with Extraordinary Concentration it seems intended to allow multiple spells to be cast, however:
Source.Originally Posted by SRD
The reason you cannot cast spells while concentrating on one has nothing to do with the standard action of maintaining a spell - as such in the written word of Extraordinary Concentration it doesn't actually allow you to cast spells while concentrating on another one - it is clearly intended to (Swift Concentration does not seem to be) but it actually doesn't do it (at my reading of them).
I am unsure about this the spell mentions 'You move objects or creatures by concentrating on them' so if you concentrate on a different object it stands to reason you can move that one, just like you would (on my reading) not be limited to tripping the same creature every round using the combat maneuver version.