add option to change movement level

[Haroenv]

right low the left-right movement is hardcoded, this could be set by the user.

[Haroenv]

It's quite easy to do, if someone wants this implemented, let me know or send a PR

[Haroenv]

in v2.7.1 it's changed so that the movement L-R is a sine wave, so that would give two variables. Probably just going to let the Amplitude be changeable though