I notice a lot of questions tagged VMware should be migrated to ServerFault, but the option is not available as you can see in the picture below. Is there a way to pick what options show up here?
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Too many bad questions were being migrated from Stack Overflow to Server Fault. Rather than letting that continue to happen, Server Fault was removed from the list. See: Regarding the high number of rejected migrations from Stack Overflow to Server Fault.
The migration list is not customizable, so if you see a post that you think should be migrated to a site not on the list you have to flag it for moderator attention. Please only do this if you're very familiar with the target site. Moderators often aren't, and we don't want to be responsible for more bad migration.