I've added a template option for NT 11.12.
However it's gonna get complicated because there are "logical" columns (prompt/value/comment) and "physical" td columns.
So in your case you are spanning 2 "logical" columns, but actually 3 columns in the html (because you're spanning value / prompt / value). If you have comments on then it would be 4, and so on.
Calculating this (in code) is tricky because it's possible for some fields to suppress comments, span prompt/value/comment cells and so on.
so for now I think I'm gonna use this setting as a _physical_ setting - but that means if you change the layout of the form it "won't change" and hence will likely be wrong. But it's a simple approach in the short term.
Cheers
Bruce