Text Anchors with a reverse occurrence index

Currently when using a text anchor to place a field or signature block, we can specify the occurrence index (i.e. 0 = use the first occurrence of the specified text. 1 = use the second occurrence of the specified text.. etc.). A great new feature would be to allow us to specify the occurrence index in reverse order (i.e. 0 = use the last occurrence of the specified text, 1 = use the second last occurrence of the specified text... etc.). A boolean flag or enumeration value to indicate which direction to search for the anchor text would be great. In our scenario, the anchor text used to locate fields and signature blocks almost always appears on the last page of the document. But the anchor text can appear a variable number of times throughout the document so being able to specify the search direction would eliminate any false positives should the document contain an unknown number of occurrences of the anchor text.