There are in fact two exclusion lists: one in program settings, for the on-demand scanning.
Maybe this workaround could help you untill we find a solution.
For the Standard Shield provider (on-access scanning):
Left click the 'a' blue icon, click on the provider icon at left and then Customize.
Go to Advanced tab and click on Add button...
For the other providers (on-demmand scanning):
Right click the 'a' blue icon, click Program Settings.
Go to Exclusions tab and click on Add button...