On the subject of taping a zoom, I use one of those silicone wrist bands (like the livestrong ones) on my 15-85mm. Have it near side of the zoom ring, even so that it overlaps the FTM focus ring (this doesn't limit focus performance as the ring stays still when AF is working anyway).

Not only does this allow me to use it as a prime, it also stops it dropping to 85mm when it's on my black rapid.