Remote Buddy is already watching the iTunes Library file for updates 
made by iTunes. There is no other way to notice changes (there are no 
events or hooks to notice additions to iTunes' library) and no other 
equally fast way to grab the entire iTunes library information. It 
sometimes takes iTunes a few seconds before it updates the library 
file. And as soon as iTunes does that, Remote Buddy updates its 
internal database with the new information.

There is no faster way to fresh information other than the automatic 
updating Remote Buddy is performing the second new information is 
available. A refresh button would not change that.

Best regards, 
Felix Schwarz