Should be possible. But if you can add this in the Features section, it's the better mean to don't forget this new feature (in the portail, under Download, click on "Features").
Per your request:
Originally Posted by MetaMythril
First off, cool addon. Would it be possible to have the option to change the alpha level for extra quests tracked that aren't the main "active" quest? I like the extra ones being there as it makes it easier to switch to a different active quest, but would like to reduce the prominence of the others so it doesn't look like a wall of text running down the side of my screen. Just a thought. :p