I often manually add songs to the Library because I must assign tags or ratings to individual new songs (it's logical to do so when add new song). But sometimes there are over 100 new songs, and then I don't have time to wait for the "Process audio tracks" to finish its job. Especially if it has to go through all 5 processes, it takes quite a long time.
So, I thought it would be best since the songs are already in the Library to schedule the Process tracks to run overnight. I hoped that scheduling the Library update would be the solution, but it's not because if no folder is added, it deletes the entire Library!!! That's very dangerous for me, that a wrong command could delete the entire Library! This should be fixed, and while you're at it, why not make it so that, for example makelibrary normalize:-9,0;skip|silence:skip "Funky" processes new songs in the 'Funky' Library. Very simple.