I agree that kind of messed up with the freezing address as coin control but I am sure that you can customize your fee in Android Electrum.
Unlike the desktop version of electrum, you can't set the fee rate to any amount you want in the Android version.
If you use statistic method when setting the fee rate, electrum allows you to set the fee rate to 1, 2, 5, 10, 20, 30, 50, .... sat/vbyte.
There are also mempool and ETA methods in which electrum gives you estimations for the fee rate.