Deleting default probability and impact columns from Risk list

[Tom Mitchell]

Hello,

Is there a way to delete the default Probability and Impact columns
under Risks in Project Web Access/SharePoint? Our client wants to use
a 1-5 rating for each, so we've implemented drop-down menus in place
of the default numeric fields. If we can get around having to create
a new 'Risks' list, based on the default but without Probability and
Impact, that would be great.

Any help is much appreciated....

Tom Mitchell
acrodex inc.