i say leave browse the way it is:
if you don't like it get off L W, or find a constructive way of changing it for the betterment of ALL. i don't see how optionally shutting it off helps anyone. when i'm on, "browse" is on.
if you don't want to share your files, get off L W, you don't belong! i may not like "freeloaders", but since there is no REAL way of knowing which are i haven't banned anyone.
if you don't want "break-ins", disconnect your computer.

i share around 3,000 files in L W, i have loads more. i reasonably expect that the rest are free from browsing. however because of jack***es that only want to do harm, you can only expect so much. i'm not computer savvy.
if you want that much security (or privacy) on a computer you need to turn it off.

share: #2 to receive, use, etc. IN COMMON WITH OTHERS --
give: #1 to make a gift of
take:#31 (slang) to cheat ; trick

p.s. givers beware; takers, may you D L the only file i haven't previewed that has a virus! (i would never knowingly share such a thing)
i welcome all sharers and browsers.