[Plugin: WP Survey And Quiz Tool] Some invalid HTML codes found

1. In the quizzes page, the * before the question and in the answers page, the colors for the correct and wrong answers uses the font tag which is depreciated. I strongly suggest that you use classes for these colors. Font tag Depreciated
2. I also suggest that the section title not be an H1 tag.
3. What could be the consequences if I heavily modify the core plugin files and then perform an upgrade? All my customization would be gone. I suggest there be a template system.

I hope you will implement them in the next releases as this plugin is too good to go away.

http://wordpress.org/extend/plugins/wp-survey-and-quiz-tool/