Feature request: HTML table formatting

["Daniel J. Sinder" <djsinder@gmail.com>]

Generally, I like the latest incarnation of HTML table formatting,
in particular because I can control the presence of horizontal
lines.  But, now I'm spoiled and would like to do the same for
vertical lines -- on a table-by-table basis.  With the rules=groups
attribute (already the default with org-mode), this can be
accomplished in HTML using the COLGROUP element.

What about a new column delimiter (e.g., '!') to indicate column
groups in addition to columns?  My hope is to have something like
the following be possible:

!        !  Col A  |  Col B  |  Col C !
!--------!---------|---------|--------!
!  Row 1 !    A1   |   B1    |   C1   !
!  Row 2 !    A2   |   B2    |   C2   !
!--------!---------|---------|--------!

The '!' lines would appear in the HTML rendering, while the "|"
lines would not.  Or, as an ASCII export:
|-------+---------+---------+--------|
|       | Col A   | Col B   | Col C  |
|-------+---------+---------+--------|
| Row 1 | A1        B1        C1     |
| Row 2 | A2        B2        C2     |
|-------+----------------------------|


Dan