Why? It's all the same thing, a group of private keys. If it needs to be more secure, require a password, biometric access, whatever. There's no good reason I can think of to distinguish between one keystore and another.
Entering a password every time you want to send coins (or pulling out your... dongle... err, that didn't come out right, uhh, fetching your one-time-password-generating-device) might be annoying enough that withdrawing 50 or 100 bitcoins that you can spend with minimal hassle would be a nice feature.