[Plugin: WordPress MU Domain Mapping] Can not change domain mapping settings

I am using WordPress MU Domain Mapping on WordPress 3.3.2
I am trying to change the settings from

() Remote Login
(*) Permanent redirect (better for your blogger’s pagerank)
(*) User domain mapping page
() Redirect administration pages to site’s original domain (remote login disabled if this redirect is disabled)
() Disable primary domain check. Sites will not redirect to one domain name. May cause duplicate content issues.

to ->

(*) Remote Login
(*) Permanent redirect (better for your blogger’s pagerank)
() User domain mapping page
(*) Redirect administration pages to site’s original domain (remote login disabled if this redirect is disabled)
() Disable primary domain check. Sites will not redirect to one domain name. May cause duplicate content issues.

No change sticks when submitting the form.

Is it possible/critical to change
dm_redirect_admin
dm_remote_login
dm_user_settings

in the sitemeta table?

These are no variables I plan to change regularly. I just need to change it now and never again.

Thanks in advance for an answer.

http://wordpress.org/extend/plugins/wordpress-mu-domain-mapping/