There are various possible ways to implement reserving an amount of TWINS in order to pay the cheaper rate of trading fee using TWINS. Maybe it could be a tiny toggle button with a red light just above the right side of the [100%] button, that with the red light on the [100%] button will fill the Amount with 100% as it works now. If you click the tiny button making it green, it could change the [100%] button to [98%], customisable in settings (to a particular amount of locked TWINS, or a chosen percentage), if desired. A hover caption for the button could say "Save fees by reserving TWINS".