::Thanks for your comments, Ras. 
 ::I believe that in the case of Welsh and Scottish hill names, pronunciation is a useful use of space, much more so than, say, col height and county/district which I think should probably be deleted from the tables. The first was left over from the list of peaks by prominence, and the second merely an experiment of mine. The spellings of the names are so foreign to English speakers that I can't see how an easy-to-read pronunciation would be anything other than helpful, so I honestly think that if we have space on the page, it should stay. Here, we do, especially if we remove the above fields. On the Hewitts and Nuttalls page, I got round the space issues by moving the pictures to galleries in between the tables, which doesn't seem to have worked out too bad. I doubt there are many more fields that should be added, anyway. 
 ::As to whether the pronunciation is IPA or not, I don't wholly care, although we don't have space for both and I do prefer respelling - the reason being that this can be read (and understood) at a glance, whereas IPA, in my experience, can't. Or some sort of compromise can be made. I agree with the two examples you've given - I was literally about to replace (th) with dh as I've done on the Hewitts and Nuttalls, and using a special symbol for the schwa doesn't seem obstructive when it comes to quick reading. Perhaps other substitutes could be made for sounds that are difficult to represent in English, but I don't want to go for every nuance, just a reasonable guide. 
 ::Roll on the hideable columns!