While you are in a transform state you can either adjust your values by moving the mouse or by typing numbers into the keyboard.
When using the keyboard all numbers are supported. You can use a decimal number. For scaling and moving there is also support for axis-locks, just press X, Y or Z.
While in a transform state you can press D to duplicate the selected lines in the current state and still remain in the transform state and K use the currently selected lines to cut other lines.