Salvete! Firstly, let me say that I absolutely love Screenshot Captor. Since I started using it, I have no longer been interested in trying out other screenshot programs!
Now, for my request. I would like to see some more autonaming tokens.
The one I would like at the moment is similar to %nicename% or %windowtitle% - but I would like some automated cleanup.
I am using some of the files in Sharepoint, and Sharepoint doesn't always like the file names.
I would like an option called %webname% or %cleanwindowtitle% where all the spaces and non-letter/number characters are removed or swapped for - or _ , and the words are CamelCased.
It might be better if, when you add a %webclean% token to the "Default New File Name" box, that the token tells SC to work the magic on your definition. That is, you could put %windowtitle%_%datetime%%clean% and you would get a cleaned version of %windowtitle%_%datetime% - so %clean% isn't acually a token, but a command to run on whatever text preceeds the command.
In this fashion you could have %swap[|-%%swap]|-% which could swap all the  for - characters in the string.
Some ideas here!