Thank you for the feature request -- the "extract fee" from amount is probably not a high priority as the feedback we received from users is that paying bills required the exact amount to be sent.

Furthermore we have been doing testing with a number of crypto-currency kiosks which DEMAND a user send the EXACT amount requested on screen.

We believe that the trend in the future will be to pay fee's in addition to the amount sent.

As for the LINUX wallet we already have a command line version working (our seed nodes are LINUX and have been running non-stop since day one) -- we recently announced our plans to support the Raspberry Pi system which will including a QT user interface.  Perhaps we will get a desktop wallet for INTEL out of the process as well!

-dvd