Picasa Renaming multiple files

Ror years now I have been irritated by two aspects of Picasa when renaming multiple files.

1. If the the name ends with a number it increments this number and does not just add an incremental suffix
   
   Example if there are 3 photos that end with, say nikon_d80, it makes the files name end with d80, d81, d82 whereas what I wanted was d80-0, d8-1, d80-2
   
   
   
   
2. If the name ends with a none-number letter then it adds nothing to the first, and then increases by one thereafter.
   
   Example if 3 files end with tree, it will be named tree, tree-1, tree-2 and to ensure they are displayed in the correct sequence I have to rename the first file as tree-0 after the bulk rename as a separate step.

By chance I realised that you can combine the two deficiencies to acheive what I want. In the d80 example just make sure the name ends with d80-0, and then Picasa will rename the files as d80-0, d80-1 and d80-2