Miners can already do this.
Miners already don't do this.
Do you think that by creating a post here at bitointalk, suddenly miners are going to say:
"Hey, piotr_n said we should do this. We'll do what he says."
I'll watch the blocks for the next day or two, but I suspect your demands have been ignored by the mining pools.
Perhaps take this to the "Mining" sub-forum instead of the "Development & Technical Discussion" sub-forum and see what the miners have to say about it.
Note: Bitcoin is a voluntary system. We can't force the miners to implement your idea, all you can do is ask them, and then wait and see what they do.
I think I can certainly find a few people who find this idea interesting, some of them maybe mining pool operators already, others their friends.
And then, we can maybe work out some standard, add these options to the protocol and deliver a useful feature for the community.
Obviously not supported by the Bicoin Core - you guys are to proud, and have too powerful sponsors, to ask some dirty miners how much do they want to mine your so important transaction.
But other bitcoin clients/wallet? They are not as proud and all they care about is progress - to move this project forward.
Alternative clients would quickly adapt such a simple protocol.
Not even clients - you can just as well provide this information to the community as simple web page.
And then even people using the bitcon core would finally know what fee they should put, since they need to send it now.