Three problems with the Exclusion-Plugin control panel (see attached image):
1) It reports parameter variable instead of the value that the parameter variable points to.
2) When I replaced the variable with a pure text parameter, the control panel did not update to reflect my changes - it still shows the old variable.
3) I couldn't enter or find anything in the "Resource name" section of the control panel and I could not release a resource

(In the attached example, I set the job build parameter RT_IOBLOCK to 'A' for testing, and entered '$RT_IOBLOCK' in the Build Environment "Add resource to manage exclusion" section. The control panel should have shown the resource to be A, but instead showed '$RT_IOBLOCK'. I then changed the "Add resource to manage exclusion" to 'A' and ran the test. The control block should again show 'A', but has not changed.)

BTW, this plugin is nonetheless great. Thanks.