Reverse/change transition on Previous button

Hi all,

Is is possible to have different ("opposite") slide transitions when users move forward and back through the slides? I'd like to use the Uncover Left transition between slides when clicking Next, but it looks very confusing having the same transition when clicking Previous as the slides appear to still be moving ahead. Ideally I'd like to be able to change the "back" transition to Cover Right to make it look like the slides are reversing back.

Any suggestions welcome! Cheers!