I haven't exactly tried this, but I think it should work...
Your 'Slices' lie along one audio track butting to each other right?
Note down your project tempo in the transport bar
Make sure audio track is set to 'musical' timebase with the crotchet sign showing near the track name
Next slow down the tempo drastically, for example from 120bpm to 40 bpm
Switch audio track to 'Linear' timebase
Return tempo to original BPM
Switch audio track back to 'musical' timebase if desired
Now your slices should have gaps between them. Not all equal gaps if the slices are different lengths, but separated at least.
I hope this helps
Cubase 6.5.5 Build 176
System 1: AMD FX 8350 8 core 16Gb Win 7 64 Asus M5 A97
System 2: AMD FX 8320 8 core 16Gb Win7 64 Biostar A960D+