While I have not tested this - the drop box has the "back" class assigned to it in tpl_modules_attributes.php and this is used for several other things. So adjusting via css will most likely cause issues on other pages. But you might be successful at changing the div class to one not existing and using css width & float to align.
Try editing the red text to ???drop??? or another name in tpl_modules_attributes.php.
Code:
<div class="wrapperAttribsOptions">
<h4 class="optionName back"><?php echo $options_name[$i]; ?></h4>
<div class="back"><?php echo "\n" . $options_menu[$i]; ?></div>
<br class="clearBoth" />
</div>
Use overrides for this or if you have not created your own template just preserve the original in case this messes things up
See what results(should not be much different), then post back and one can address this with css