Well we could just explain what we already do but be terse about it.
We accept contributions from everybody. Because our code is used in critical software and of a complex nature, we generally prefer contributions from members familiar with our code base, especially in core areas.
This generally means frequent contributors have a more likely chance of having their code accepted or accepted faster than newcomers.
A member of our community will inspect your contribution and if it is unacceptable in its current state, we will make suggestions for improvement.
In some cases, your contribution may not fit into our current code/documentation base. In these cases, we will reject it and explain why it cannot be used.
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That feels long and wordy I know, but not sure how to make it shorter.
Thanks,
Regina