Amiga PUAE, slow down mouse cursor, make full screen?

Looking at playing some games that use cursor to play. At the moment on an Android handheld the cursor is too fast, and sometimes when the menu pops up, it would be easier to use d-pad. Is this possible?

Also is there a way to make game by game the screen bigger and in correct format? I've chose full screen but it's stretched it rather than made bigger and still doesn't fill my screen on O2P.