~~Per the results of the Community Wishlist Survey and following the approval of this proposal by SRE, RequestWiki should warn users of potential issues with their request that could cause it to be declined such as a very short description, a taken subdomain name, and any other potential issue we can think of.~~
Per a discussion above with Naleksuh, it doesn't make sense to proceed with the original idea as users are likely to still want their idea to go through rather than actually make any changes and are likely to just play around with keywords to attempt to deceive us.
Therefore what I would propose is for the request to proceed but to be put on hold and an automatic message would say "Please note that in its current form your request is likely to be denied." or something similar.