Yes -- there's a separate download you can get from BB that is *only* the underlying "Device Manager", which is basically the USB driver that controls the current flow (100mA -> 500mA) when you plug a BlackBerry device in. I keep the installer on my SD card for easy access in an emergency.
Start here: BlackBerry - BlackBerry Desktop Software | Applications to Synchronize Your BlackBerry and Desktop Data
Click the Download link at the very bottom. From the next page choose the "Desktop 4.2 service pack 1" choice near the top, click Next. From the next page, scroll down a little bit and look for this:
BlackBerry Device Manager v4.2 SP1 (English)
* Download includes: Device Manager
* File name: BlackBerry Device Manager (English).msi
* File size: 11.3 MB
* Date posted: 06-Feb-07
This is the tiny installer you'd want to keep on the SD card, and install on a PC to provide proper charging of your device.