Add {{Brainstorming}} at the top of a page warning that it is in a brainstorming stage.

{{Brainstorming}}
{{Brainstorming|policy}}

Suppress categorization in Category:Wikipedia draft proposals for policy brainstorms.

{{Brainstorming|policy|nocat=y}}

Displaying proposed shortcuts

{{Brainstorming|WP:Test|WP:TESTLINK}}
{{Brainstorming|policy|WP:Test|WP:TESTLINK}}