That is already possible with the syntax used in MRT (MultiRenameTool, press there F1 and read the help)
Can this thread now moved to the English forum, or did you wanted something different?
You can use that for work with plugins:
[=tc.Name:9-10].[=tc.Name:6-7].[=tc.Name:1-4]
and now since Total Commander 10.00
All placeholders in button bar or start menu like %N, %P now support substring fields in the form :~start,end,
e.g. %N:~2,5 (5 characters from the second) or %N:~-8,5 (5 from the 8-last)
Help wrote:
All parameters now support substring fields in the form :~start,length, e.g. %N:~2,5 or %N:~-8,5.
To append a number directly after the length value, use another ~ character, e.g. %N:~2,5~2.
Negative values are measured from the end of the string.
Example: %P:~0,-1 cuts off the backslash from the path.