sure. i use the CUE button for internal playback (no timecode) and the PLAY button to switch seamless to relative mode - this way it can go back and forth without any skips and all.
(the reason i'm using play and cue button reversed is that it fits this way the traktor screen, but you could do that of course different)
for going into relative mode you have to map the following:
timecode > playback mode int/rel/abs
type of controller: button
interaction mode: direct
set to value: relative mode