For the first question, you'll need to find the CSS that controls the column widths and adjust them. I'm not really in to CSS but I looked at it a little and I think it's in the forumbits.css template (under CSS templates in the Style Manager "Edit Templates" page). If you use Firefox with the FireBug addon, you can right-click on the part of the page you're interested in and choose "Inspect Element", and that will help you figure out what CSS is used in styling that part.
Sorry, I don't know anything about mobile styles.
ETA: or do what was suggested above and contact the person who wrote the theme...
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