Please, add full file rename capability
Is your feature request related to a problem?
evix2 renaming feature doesn't allow to rename the so-called "file name extension", which is kept as is.
Describe the solution you would like
exiv2 should allow for a complete rename, so-called "file name extension" included. Either and extra option (-R) or a smart choice when the "-r" formatting string contains a ".something" at its end.
Describe alternatives you have considered
A shell script to do a second rename loop to also change the so-called extension.
Additional context
I need to gather photos from a number of sources that name them with different so-called "file name extension": .JPG, .jpg, .JPEG, .jpeg, .tiff and .NEF. I want them to all either have .jpeg or .tiff name "extension". This is a Linux environment so the concept of "file name extension" is rather useless from OS perspective while it still makes some sense for humans.