external usb drive

1. Can you install Vista on external USB HD ? ( It let you choose such drive ) ? 2. Improvment in Vista needed to better support external HDD: To increase my computer performance I put "temporary files" on my external HDD ( Decreasing the load on my main HD ) I have done so using the following technics: 1. Set the location of Internet file cache to the external HD. 2. Set the %TEMP% %TMP% of both system and user to the external HD.
This soltion requir some improvment from the OS: Having alternative , default location on the primary partition in which the OS is installed. Having that will enable me to detach the external USB drive without having problems with applications.
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