I use this extension constantly in large projects, and I rarely select a location other than "current file". However, I must still wait for the list of directories to load. Would there be interest in a new command extension.advancedNewFileHere that always creates the new file(s) relative to the open file? This way, the two commands could be bound to separate shortcuts and I could choose which to use based on what I'm doing.
I'd be happy to submit a PR for this; just wanted to gauge interest first before committing to anything.