So, it was recently asked when a community consensus is reached. Additionally I have observed a lot of users having no overview at all of the current rules, so for the last few days I have been considering making a list of the current puzzling.SE-specific rules that exist so that one is able to read through them in a couple of minutes.
Either way, I went through all questions on meta that fell within the aforementioned category and determined whether they contained an actual rule/policy proposal (a lot of posts simply commented on the situation without providing solutions and are thus not included).
Current state of affairs:
Riddles (46 votes)
Per the highest voted answer riddles have to be brief and fall in either the calculation or interpretation category as defined by Travis Kindred, assumption riddles are not welcome. This is in line with the requirement that a limited number of answers must be provably correct.
Read more here.
Copyright & Plagarism (17-36 votes)
If copy pasting, make sure to quote and attribute it correctly. A significant set of users however is against any form of copy pasting, even if attributed correctly.
Read more here.
Specific logic puzzles or brainteasers as questions (26 votes)
As long as there was no problem posting logic puzzles and brainteasers was allowed. Note: A lot of users currently believe that there is a problem, thus making this consensus out of date.
Read more here.
Presence of meta information in titles (19 votes)
Things like "[very hard], [difficult], and (easy)" are not welcome in question titles
Read more here.
Questions that fit a large number of possible answers (13 votes)
Questions must have a limited number of answers that can objectively be proven to be correct. Do note that this outlaws a large number of current questions.
Requirement for explanations (12 votes)
It was proposed that any and all answers that do not provide explanations should be deleted. And now there is a consensus that the answerer needs to add the explanation with the final answer.
Needs voting due to controversial nature
Outlaw puzzle-only questions (12 votes)
In this proposal it was suggested to solve the quality problem by requiring questions to be either about the puzzle making process or the puzzle solving process. Simply dumping puzzles without a question would not be allowed.
Requirement for spoilers (9 votes)
There is a debate over whether or not spoilers are required, forbidden, etc.
Please feel more than free to edit this post. It's not meant as a canonical post, nor am I expecting to keep it updated, however short term it could be a valuable page in the process of determining the direction of this site and reinforcing the choices that have already been made.