After having done a few patterns with alternating weft colours, I am all for the idea of using a floating selvedge. If you’re not familiar with this little trick, then it’s where you have an extra warp thread each side of your warp that isn’t woven in the pattern.
This allows you to always catch the weft, regardless of whether the pattern would take it into the shed without wrapping around a selvedge thread. (Trust me, it’s really annoying trying to get a neat selvedge when you have the weft sometimes being caught and sometimes not!) So, with the floating selvedge, you enter and exit the same way regardless of direction – i.e. over on the way in and under on the way out (or vice versa).
A few things to note about floating selvedges though… firstly, on a rigid heddle loom you need to pop them in slots so they are never lifted or lowered… secondly, you may need to weight them, because, as you weave, those warp threads won’t be used up at the same rate as their pattern baring friends and will get a bit soggy.
Now, I haven’t tried this yet, but I gather S hooks are good weights to use.
You can also avoid warping them with the rest of the threads by having them hang – weighted – down the back of the loom. To my mind that’s probably more work, but I may be proven wrong!
I’ll let you know how I go when I finally try it.