It would be really nice if the user could set the tx fee to 0 or lower than 0.0001.
For most Transactions 0.00001 or 0.000001 BTC fee would be enough. So it would be nice to set the fee at the users own wishes.
BTW: I really like the App.. especially the function to spend btc directly from a cold / paper wallet.. good job guys.
Right now the fee in default Bitcoin-QT nodes is hardcoded to 0.0001BTC, so setting it lower runs the risk of your transaction not being broadcast. We will lower the fee once 0.9 comes out, which will drop the fee further.