How to modify the content of question form ?

Hi !
For the purpose of a website, I have made some comparaisons with all Q&A plugins and I think DWQA is one of the most interesting.
However, I would like to modify the content of the question form, without modifying the content of the plugin itself. I need to pass a parameter value to the URL (ie : call http://mywebsite.com/dwqa-ask-question/?reference=90037990) and force the Question Category to the “reference” value passed as argument.
To achieve that I need to modify the dw-question-answer/inc/template-functions.php, that I would like to avoid (because for each new update of the plugin, I will have to modify that file again).
Is there a way to templatize the content of the Question form ?
Thank you for your help,
K.A.