I'm sorry, but I don't think I will implement keyboard controls for a number of reasons. The most important one is that I don't think it will be used, because I think it degrades the game experience.

Using the touch screen makes ship movement MUCH more smooth. Have a look at videos on youtube of games like Raiden, super R-type or Gates of Zendocon, and focus on the player-ship movement. You clearly see the left/right/up/down pattern of the controller.

If you prefer to use the keyboard because your finger is blocking parts of the screen, try to place you finger below the ship. You do not have to touch the ship to make it move, the game uses the relative movement of your touch. So you can control the ship by touching anywhere on the screen.
The stylus also works very well!