@Dvorapa: Re: button colors - One goal of the ongoing design work, is to make a User Interface that is consistent, as in, once people are familiar with a button's action/outcome, they can expect consistent results. Hence, the button to submit a form (as in this extension, and others) should always be a single color (blue in our case). There's some related information at this (slightly outdated) page: Wikimedia Foundation Design/Color usage#Functional Colors.
Re: heading levels - I almost filed a feature-request for this in phabricator, but then I couldn't find any examples (I checked a few dozen pages linked from en:WP:Requests). Here's what I had drafted; please add your use-case, and any pre-existing examples you can find, and post it in phab.
- Title: Allow inputbox to create an H3 heading
- Description: Suggested feature: The addition of a new parameter, which would let an inputbox specify what Heading level to use, when creating the `section=new`. This would allow editors to use it more flexibly, on pages where the desired practice is to create feedback in a series of H3 sections. Example pages where this practice is wanted (or already done but manually) include ...
Note: I'm not sure if this is technically feasible though. The current system just hooks into the standard "New topic" tab on all talkpages. Adding new code to allow changing the H-level might be more complex than is desired.