CCK and tables

I'd like CCK to do tables :-)

One existing solution is the Matrix Field module: it provides a new field type where you can set up a matrix of textfields. The data type is string, and seems to be independent from the other CCK field types.

This doesn't meet my needs because I'd like to mix different CCK fields, for example a column of nodereference fields with a column of number fields.

Attached you'll find a rough and hackish proof of concept of a different kind of implementation which leverages multiple-value fields for the data and widget settings, and arranges them in a table afterwards, like fieldgroup does.

To make it works you will need fieldgroup:
- create a new group, and check the option "Displays form items as a table"
- add a bunch of multiple-value fields to a group

This could be very interesting combined with Computed field and Views Calc, allowing Drupal to have spreadsheet-like functionality.

However to work properly it will need some changes to how multiple fields work, like allowing to preserve delta, fix validation and probably more (see http://drupal.org/node/93447 and http://drupal.org/node/93671)

What do you think?