HTML test mail page does not remember filter

There is something awkward about the test page. Every time I want to send an email, I have to change the filter manually from "plain text" to "mail_filtered_html" (my custom filter). If I forget to change it, all of the html markup in the template is sent as plain text, along with the contents.

I often need this page and I often forget to change it. Is there any way to change/configure the default value of the filter, and/or make it remember my last filter choice? It's a bit stupid that the test form for "html mail" assumes by default that I don't want to use html...