Hi,
after having read BIP100, 101, 102 and 103(?), after having seen many discussions, after having heard many arguments, after weighing many pros and cons, after having read study reports about the effects of congestion in the transaction queues, after thinking for myself what other solutions might exist, I made a write-up about a solution that combines and considers many ideas and concerns. I have made several iterations of improvements before releasing the first version to the public today.
Unfortunately(?), the document has become larger than planned, it has 37 pages, but for a quick read you already get an impression when reading only page 1 (abstract) and pages 7+8 (overview).
Fortunately, it is well structured and full of information. It does not only give some basic ideas but specifies the solution down to a very detailed level close to implementation. It also has a separate chapter giving the rationale for many design decisions, and it provides simulation results (incl. simulation code) to see how the method behaves in certain corner cases.
Now I hope you have the time to read and understand the paper, and I am looking forward to hearing your thoughts. I think the interested reader will find an inspiring mixture of known and new ideas, combined in a way and detailed down to a level as it has not been seen before.
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Last update 5 Sept 2015, ~15:30 CEST]: OVERVIEW DOCUMENT in BIP Format / Github:
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Last update 5 Sept 2015, ~2:00 CEST]: FULL SPECIFICATION (39 pages):
Further sources (will not be updated as frequently as Github format above, with same content as in Github repository):
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Last update 5 Sept 2015, ~2:00 CEST]: Overview Document as PDF file (5 pages):
Looking forward to hearing from you!

Michael
PS: I have not yet tried to apply for a BIP number (but will probably do so later), that's why I put a placeholder and am calling it "BIP10X" for now.