[O] org-mode table alignment options (siunitx S-column)

[Michael Giepen]

I would like to align the decimals of the values in the following table 
with siunitx "S column".


################################################
#+LATEX_HEADER: \usepackage{siunitx}

#+CAPTION: My caption
#+ATTR_LATEX: :align lS
| Column |    Value |
| A      |   2234.2 |
| B      | 243.2345 |
| C      |     2.03 |
| D      |      4.0 |

################################################

Like this, no problem.

However, with wider tables you have to put a lot of attributes and the 
following implementation would be clearer if it would be more org-mode 
like with the attributes inside the table.

#+CAPTION: My caption
#+ATTR_LATEX: :align lS
| Column |    Value |    Value |    Value |    Value |    Value |
| <l>    |      <S> |      <S> |      <S> |      <S> |      <S> |
| A      |   2234.2 |   2234.2 |   2234.2 |   2234.2 |   2234.2 |
| B      | 243.2345 | 243.2345 | 243.2345 | 243.2345 | 243.2345 |
| C      |     2.03 |     2.03 |     2.03 |     2.03 |     2.03 |
| D      |      4.0 |      4.0 |      4.0 |      4.0 |      4.0 |

But only l, c, and r and numbers for width are recognised within < >,  
the S not.

Could this be expanded somehow to allow for any letter, or at least to 
the ones that make sense?