css markup / suffix per field

Regarding other CMS there's a pretty common concept of CSS suffixes or CSS class specifiers.

It makes pretty sense to allow a user generated field trigger some general formatting CSSes based on selection.
We're using suffixes to e.g. to colorize the field background.
Webforms is perfect for customers to create forms but a customer can't deal with CSS.

If each field would have the capability to provide additional css classes / suffixes it would work perfectly.

Thus a user could refer to CSS definitions and generate fields in a form that get triggered magically. A sample would be a sample class with "width: 49%" for 50/50 two column design.