This was mentioned by Morten Bengtson in a different thread, but it's already a year old and I figured it deserved a thread of its own.
When creating a search form, assuming you love HTML5 as much as I do, it's actually better to use a search field (<input type="search" />) instead of a normal text field. However, dwsearch really likes them text fields, so if I don't add one myself, it will assume I forgot, and simply insert one for me. So now I have two input fields besides my submit button. Sad developer.
I'm not sure how Dw should handle this, but I suggest that it should not insert a text field, if there is already a search field present in the form.