TH: >I'm wondering: are there examples of individual texts where metegs on hataf vowels vary in position? For instance, in BHS, which clearly uses a medial meteg, does the meteg also appear at times on the right or the left of a hataf vowel?
There are examples of all 3 placements for meteg, as used in the BHS in Peter Constable's Proposal to Encode Alternative Characters for Biblical Hebrew. See http://scripts.sil.org/cms/sites/nrsi/media/BibHebAltCharsProposal.pdf Joan Wardell

