Yes the needle valve can be moved, but remember that the longer the fuel line is the longer it will take for changes of the needle valve to effect the motor. With a normal needle valve that is remotely mounted this delay is usually 1-3 seconds, but moving it farther away will increase that lag time. This needs to be kept in mind when you are trying to tune your motor. If you don't wait for the changes to take effect it's almost impossible to properly tune you motor.

Hope this helps