With this package, you can open a PHP file from this namespace. The package use the fuzzy-finder package (official package). You can open directly from a namespace after an "use" (link) or you can select in a modal which lists all "use" in the current file.
Two choices !
alt+clickon a namespace in a PHP file. Paste (ctrl+v) in the modal opened just after.
Good catch. Let us know what about this package looks wrong to you, and we'll investigate right away.