There are great instructions for setting up a different IR remote in the Slice Wiki:
although I am having a little problem with programming the Ninja and TAB keys1!
Apart from those two keys, all the others work fine, and I can navigate the Slice without any double key presses or missed keys
The reason I've been trying to get a different remote working is because I too have had endless problems with key bounce on the supplied remote. I've only got the remote receiver plugged in to USB on the Slice. Double-presses and missed presses have always been a problem for me, and it seems to be getting worse with time, which I put down to the supplied remote wearing out...
BTW I'm on the current stable build, dated 20/11/2015.