If I understand correctly function of PoW mining is coin distribution and PoS was ment to later with enough honest nodes takes over coin production and other functions (but not distribution at least not directly).

Now the two (PoS&PoW) obviously do not go along too well in this form.

Would it be possible to implement alterations of blockchain sequences according to timestamp like this: only POW blocks would be accepted by clients every day except on saturday when one hour would be allowed for only PoS blocks sequence.
That one hour would be extended by another hour or similar every week, so gradually PoS would replace PoW along with coin being distributed to increasing number of people.

If people would like to collect PoS revenue they would have to open their wallets all at once and "flood" the net.
As yacoin gets distributed to more people this flooding time would get extended until it happens all the time and takes it's proper function.

I said 1 hour on saturday - but it could be any day and duration determined upfront, for example 15 minutes every day or every third day or when N increments...

I think Nfactor change should get used for any incremental phasing out of functionality not needed anymore - be it dynamic active weight calculation or something else temporarily needed.

...
second question - regarding bitcoin knowing the difference between a diff1 and diff2 block but YAC does not - could you elaborate on this Balthazar?  What is YAC missing?

Scheduling a time period for POS and POW sound strange at first, but from the perspective of coin distribution with less waste in energy, shortening the time mining machines need to run is a good thing and a similar amount of coins can be handed out by adjusting the block reward. N changes are indeed obvious signposts that can help orchestrate any major shifts. I don't know about the security aspect though.

What would be the benefit of making this POS window hard to predict? Wouldn't it be easier to have more people participate in POS if people know when they can collect their interest?

It now seems relatively very simple and innovative--and simple.

I think nonconsecutive PoS blocks looks even better now.

I've read the previous page again and my understanding is that somewhere in the future attacker generates a chain that replaces original chain with clients that are not on latest chain.

And that is all because of one (to keep it simple) PoS block inserted?

No, it's all because of absence of the correct chaintrust calculation.

Guys, have you seen that address YPGNWtN4gHFDQUvU9eC8Xzss5JCyT1ozmv with huge bunch of YACs?

It has more than 25% of ALL YAC!

Can it be the Scam or is it normal?

If I understand correctly, this seems to be a key part to the problem.

I posted about this in the Yacointalk forum to try and keep the development talk on track - http://yacointalk.com/index.php/topic,559.0.html
It appears that someone is taking all their large inputs and sending them to this one address pretty much in every block.  We've been talking about a POS attack requiring vast amounts of the coin, well, here's one address with exactly that