tablet pro

hi.
I think the trial convinced me to buy. I'll be mainly using this to play game on my surface pro 3 I5 128GB
using v2050 tabletpro
just 2 things that needs confirmed :
1. I tried the full screen (and customized the layout according to my needs). it's so cool. 1 problem is that I tried this to play diablo 3 and grim dawn. And while all the buttons still working, I can't make it visible if the game is set to full screen. But if I set the game to windowed mode (the button is visible), but the game would lag a lot, so I need it to be working on fullscreen and needs the button to still visible (like gestureworks, too bad gestureworks not working good). anyway to make the button visible when I used fullscreen virtual mouse, and set fullscreen display setting on game ?
2. why on my tablet I can't edit the layout of the gamepad ? I mean I can't move any of the button. They all just automatically used and stay still on my surface pro 3 (I can show/hide the buttons from setting, but I need to drag the buttons for the layout that I want). But when I tried it on my pc (v2048), I could move the layout of all buttons easily.
maybe I should attach real mouse to my sp3 so that I can edit and move the buttons ? or maybe because I used v2048 on my pc ? I need to work now so I couldnt try, but still wondering.

pls help.
thx.