Hi there! Thanks for the reply!
About it works with multiple touch screen, with I believe is what you are talking about when you said walk with left and use skills with right, this is an RPG Maker "problem".
The way it is designed in code give that results. My plugin by itself can operate two or more button touch at the same time, but the way RPG Maker updates the input that is the problem.
Like you can walk. But when you press Z to interact with an event, you need to press the walk button again to keep walking.
That need another plugin to handle the multiple touch the way you want.
About the button position on screen, it is already working correctly, because that is the intended behavior. If you take a look on the introduction section on the itch Io page it explains.
The intention is that the plugin works responsive according to the client/user screen size not the game canvas, taking advantage of the unused space of the black bars on the sides, when available.
Since a lot of mobile devices has different screen sizes, including tablets, this plugins aims to create that buttons according to it. So their sizes and positions are "the same" across different devices.