You will find it much easier in Renoise 2.7 as it has an automatic beat slicer which works like recycle. You will also want to combine this with dblues excellent slices to pattern tool New Tool (2.7 & 2.8): Slices To Pattern
There’s also another way to steroize a mono sound using Renoise’s EQ’s with inverted L/R channel settings. Try EQ 5 with the “Stereo Field” setting.
You probably already know this but you can rewire Reason to Renoise which is handled very well. You can sequence Reasons synths and automate them from within Renoise if you like or just route Reasons output to different mixer tracks in Renoise so you can process the sound in more ways.