How to add keys in sequencer by python ?

Hi, I’ve been looking into the sequencer_key_examples.py , but the only example concerning float keys puts everything in one array. Isn’t there a way to access one specific keyframe given its time? The example also goes thru all object bindings… isn’t it possible to deal only with an object that’s selected on Sequencer?

Where do I find good documentation about Sequencer and keyframes?

Thanks for your time.