In reply to SteveD:
Just use common sense, I find it works in most situations, assuming you've got it? Confidence roping is, as it is, giving confidence rather than looking after folk where a slip could result in death or injury!
I assume you are talking about ML type ropework which is something I've never actually needed to use working as a Summer ML in the UK.
I very rarely carry a full rope working in a ML situation. If I carry a rope and think I need to use it then I'm then working as a MIA/MIC/Guide.
You are more likely to need to reassure folk in the winter rather than in the summer due to the variability of the conditions. Sensible planning and route choice should avoid this as a summer ML and even then a helping hand (holding their hands or grabbing clothing or the rucksack straps) and a bit of spotting will cope with most situations.
So in answer to your question climbing tape is fine for confidence roping, that is unless you are doing your Summer ML assessment!!!