I strongly agree with what you are saying here.
To my knowledge, the same feature —along with others related to it— has been asked in the following threads. You may want to check them too:
<a href="http://community.roll20.net/discussion/787/customized-placement-of-images-and-maps-inside-roll20-tabs#Item_1" rel="nofollow">http://community.roll20.net/discussion/787/customized-placement-of-images-and-maps-inside-roll20-tabs#Item_1</a>
<a href="http://community.roll20.net/discussion/622/removing-the-map-anchor#Item_1" rel="nofollow">http://community.roll20.net/discussion/622/removing-the-map-anchor#Item_1</a>