A minor inconvenience is that the text editor for the 'Rules, written in HTML' field in the Edit screen for presets starts in WYSIWYG mode, which strips the HTML of any existing content of that section from everything it doesn't know, in particular script tags, before you even get a chance to see it. If it would start in 'Source Code' mode, as it does in the submission for for member-contributed articles, the original content would be respected, and people that do not want to use any special HTML there can still easily switch to to WYSIWYG.
Okay, it now opens in Source mode.