The 5.31 was an oversight and I've updated the adm-misc.php to reflect the correct version number.
The sidebar images is not an option (hasn't been), you have to modify line 24 of the sidebar-rightclose.tmpl file:
display_gallery("random", "", "", 1, 6, 1);
and replace the 6 with the number of images you want.
This really should be an option, though.
Please do not PM me for support or sales questions. Thank you for your understanding.