For now, in sellacious, there's no configuration to hide these options for sellers. However below is the patch, by which you can hide cache and auto fix for other users except for admin.
Go to file ../sellacious/templates/sellacious/index.php
and in line no. 152 add
<?php if ($me->authorise('config.edit')): ?>
after this in line no. 167 add
<?php endif; ?>
I hope this helps.