1. would it Un-balance the game- Suggesting a giant god sword that allows you to kill everyone would kind of make blunt useless so think before you suggest.
2. Can the devs do it- suggesting they add seasons or something of the like takes alot of time to do try to consider how long it would take devolopers to make what your suggesting and if the current engine could actually do it.
3. Don't ask us if "we want so and so feature"- We all want more features in Skyrim so creating threads like "Don't you guys want like dragon mounts in the game" if your going to suggest things suggest them and try to really flesh out your idea.
4. Does it fit with the story- Don't suggest anything that dosen't fit with the current setting, please no aliens no guns no laser rifles.
5. (This is more a rule for in the future but stick with me) If you see something you want in the game and its not in the game then start modding.