(I don't know any other place to communicate this to the UberPos community so feel free to delete this post if this is not the right place.)

I've been looking for a way to update a single stock by scanning a barcode with no luck until today I found the Advanced Stock Updater and it was a great start. I modified it with uberpos multi location support and removed some confirmation boxes for easier updating.
You'll find it here: http://drupal.org/node/1165380

It does the following:
Scan SKU with barcode scanner (or enter it manually)
Stock boxes for total and individual stores (up_multi) is shown in individual text fields.
Change a stock level and press enter. Stock updates, form exits and readies for next scan.

E.g you can not update stock for multiple locations with one scan.
No mouse clicks should be necessary for the entire process.

/Ludvig