Wp Multi Network 2 issues

I am trying to use this plugin, Wp Multi Network. There are two problems with the setup and I hoping you will be able to assist me as I am not familiar in this type of coding.
The plugin can be found at: http://wordpress.org/plugins/wp-multi-network/
Its free of course to download and test out.

Anyway, the two problems are:
1) The cookies are not shared between networks. Is there a way so that user don't have to sign in when changing networks?

2) As instructed here (http://wordpress.org/plugins/wp-multi-network/installation/), the plugin devs say to remove the code define('DOMAIN_CURRENT_SITE', 'your site.com'); from the wp-config file.
yet when I do that going to the main site for each networks home pages sends me to domain_current_site which results in an error.

Furthermore, when I try to change it back, the error is still there. This is worrying me.

I looked up issues for this and found this:
however, I am not sure about this. Will this work? or is someone able to assist me in fixing these two issues?