In addition to the general Posting guidelines, there are some things that apply to the Suggestion Corner in particular.

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Be specific
"I want to have feature XYZ" is in most cases not a very productive statement. You should always include a detailed description of how your suggestion would practically work. It is acceptable if you don't, but most often, vagueness doesn't lead to anything.

What are the benefits
You can describe your idea in any detail possible, and still, it might not be of any real value to implement it if there is no apparent benefit. And even if there is to you, you should always consider whether there would be a practical usability for other users as well. Suggestions specifically targeting a single user or a group of users are generally not acceptable.

Consider compatibility
While a suggestion in itself might be good, it needs to integrate into the existing program somehow. More specifically, it has to integrate in such a way as to preserve compatibility with all existing material. Suggestions which would break compatibility are not acceptable.