If editing an address seems to have multiple negative side effects, it is probably part of an important subroutine. Make absolute sure that each address you submit works as intended and doesn't mess up other parts of the game.
Descriptions such as "Tilemap related" are insufficient and should be avoided. Be sure to always make your description detailed enough, such as the exact effects certain bytes have on the address.
It's very common to people end up submitting an entry which is part of a (large) already submitted entry. Depending on case, it is either recommended you submit the whole address range with your new information or break it in smaller pieces if you believe they're not dependent with each other at all.
The purpose of this section is to hold information only about the original, unmodified SMW ROM. If you want to include some information about a hacked ROM, please use the Hijack Map instead.