Well, it may not suit your particular situation, but what we are doing in regards to the looping thing…
We break the file into sections, the ‘lead-in’ part, and the ‘loop body’, and we use sequencer to string them back together and play it.
Yes, we have sequencer events, but those are for other things.
Just by itself, if the bk2 asset is set to looping, then it loops when you trigger it.
(Which incidentally, is totally hilarious when you have a video with audio of the most ANNOYING ringtone ever, and the guy editing it triggers it in the sequencer and cant figure out how to make the noise stop 
)
If the BK2 asset is marked in the asset as looping, then they seem to loop just fine
(sometimes a little ‘shaving’ is required in the source video in situations where you need ‘beat perfect’ loops maybe)
The other thing which seemed to effect the loop playback is the bink buffer mode; stream, stream until resident, preload.