controls buttons when selected files (cut, copy, delete) at the bottom
change a location of control buttons (cut, copy, delete) because the fingers do not reach the upper edge
This request is already being worked on here: http://neatbytes.uservoice.com/forums/274528-solid-explorer-2-0/suggestions/6999849-toolbar-flexible-both-bottom-or-top
And previews here: https://plus.google.com/+KrzysztofGłodowski/posts/U9dvxGxKoT4
I echo your sentiments on an expanded and customisable actions toolbar.