p2pool including transactions

[fireduck]

Lets say I am a p2pool miner.  Lets also say that I have a bitcoin service where it would be really handy to get transactions into the blockchain.  These would be transactions from my customers who may have included an insufficient fee and I'd like to help them out.

Can I include whatever transactions I like in my p2pool share blocks and then have them include in the next p2p main chain block?  I get a share every few hours at least and then p2pool gets a block in the main chain several times a day.

I haven't figure out what information is in the p2pool chain vs the main chain.  I suspect what I want is impossible but I haven't been able to sufficiently understand the p2pool code to be sure.

My guess is that whoever makes the block that goes into the main chain includes whatever transactions their local bitcoind thinks are good.  So if I happened to be the one who got the real block and modified my bitcoind to do what I want it would work.  However, that isn't very likely.

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[thirdlight]

My guess is that whoever makes the block [...] includes whatever transactions their local bitcoind thinks are good.  So if I happened to be the one who got the real block and modified my bitcoind to do what I want it would work.  However, that isn't very likely.

Exactly.