[Request] Permanent undocked split-view

On my tablet my favorite keyboard layout is the split (thumb) view, combined with undocked mode. Thats simply perfect, because the space between the to key-halfes is free to see the real content.

The Problem is, that it always switches back to docked mode when i move it to near to the bottom.

Could we have a permanent undocked mode? Or at least make the empty space of the docked split-view transparent?