customizable and centralized toolbar

[fallsdevil]

Is your feature request related to a problem? Please describe.
particularly, yes, I use few toolbar icons, so I would like to pin some, the problem is that all the icons are in the right corner of the keyboard and the rest is empty, besides I always have to use my right hand to select one of them, I type with both and I wanted it to be centered like on other keyboards.

Describe the solution you'd like
we could have a similar option to the keyboard height, but customizing the spacing between the icons and/or changing their size to make it more proportional. (something irrelevant, but if possible, customize the design of the icons).

Use case
I've been using Google Keyboard for a long time, so the icons are exactly two/three on the left and right side, allowing me to easily access them with both thumbs, and I find it practical. and I also wanted this format to remain if in the near future I add a layout option for each orientation of the device, for example: horizontal floating keyboard, vertical normal layout.

Describe alternatives you've considered (if any)