I just tried this for the geek article system, and it didn't work. However, I noticed that all the templates started 'GAS_', so I used the code
PHP Code:
'GAS_' => $vbphrase['group_gas_hack'],
which turned out to be the problem. Even though the templates started in uppercase, I had to list the filter phrase in lowercase like this
PHP Code:
'gas_' => $vbphrase['group_gas_hack'],
Then everything worked as expected. As it wasn't obvious to me that I should always use lowercase for the filter, I thought I'd add this note.