Yes, I found it. I thought I posted the solution back here but I guess I forgot. Here it is:
Change the following line on 26 of login.php in the /webim/operator folder from this:
$page = array( 'formisRemember' => true, 'version' => $version);
To this
$page = array( 'formisRemember' => false, 'version' => $version);
By changing that from true to false the default will no be the Remember Me check box is unchecked.
I was also able to remove the feature completely by removing some lines in that PHP file (don't remember anymore exactly which ones), but I decided against it and to just go with leaving false the default.
Hope this helps!