Dimension, field display, default setting

Hello:

In SPM 3.0 / SP4 when createing a new report and adding a dimension, the dimension's "Field Display" is defaulted to "Description Only' (see attached for a screen shot).  We have a dimension that we want the default field display value to be "Key Only" when that dimension is added to a report.  Is there any way to change the default for a single dimension from description only to key only?

Thanks for any help.

Gary Nau