Dumbledore's trickeries: just how much is he covering up?

We know, now, from the "Santa Claus" stunts, that Dumbledore is quite capable of trickery. Reading between the lines, it appears he cruelly sabotaged Snape and Lily's teenaged relationship.

What other deceptions belong to Dumbledore? Several are possible.

• the prophecy and Snape
• Rita Skeeter's False Memory Charm
• Amelia Bones burning Narcissa Malfoy
• Lily's final Dark-ritual conversation with Voldemort

The prophecy and Snape:

The "confessor" interlude makes it clear that Snape was present for Sybil's prophecy. Does that mean that Harry is wrong to theorize that Dumbledore arranged for Snape to hear it...

... or did Dumbledore use a Time-Turner to make sure Snape heard the prophecy live and in person, so that Snape would be baited more credibly into telling Voldemort?

Rita Skeeter's False Memory Charm:

Dumbledore rewards the Weasleys for the prank, which happened to benefit Harry Potter and deprive Lucius Malfoy of a tool. Is it possible that he not only rewarded them for it, but committed the active part of it himself?

Amelia Bones burning Narcissa Malfoy:

There's suggestive evidence within the text ("Someone would burn for this") that Amelia Bones is hard-bitten and fire-minded. We also see her specifically pulling back Dumbledore from confessing to Narcissa's murder. Is it possible that Bones performed the murder, and afterward Dumbledore pretended to Lucius that he had been Narcissa's killer?

Lily's final Dark-ritual conversation with Voldemort:

Lily's last conversation with Voldemort just so happens to replicate the requirements of a Dark ritual - you name the thing sacrificed, and then the thing to be gained.

"I accept the bargain. Yourself to die, and the child to live."

Did Dumbledore prompt Lily on what to say if confronted by Voldemort, to trigger the accidental Horcruxing that saved Harry?

How much of this is Dumbledore actually guilty of? Do we know or suspect other trickeries, or have other evidence?