Lister Styles size and position

Would it be possible to add the ability to set the lister size and position to the Edit Lister Styles

That's more what Layouts are for.

If there's a reason you don't want to use Layouts, you could adjust the window placement via a command that also applies the Style, or possibly via a script that reacts to the Style being applied. But using a Layout is easiest, as the purpose of Layouts is to do everything Styles do with the addition of handling window placement and being able to save/restore multiple windows.

Never used Layout but will have a look at how they work.