Is it possible to create a shelveset from the diff of two versions of one branch just by some operations in tfs/tfpt?
e.g. create a shelveset from (changeset 2013 -> changeset 2034)
No, it's not possible. Changesets and shelvesets are different things, with different purposes. You could probably write a plugin to do what you're after (retrieve changeset, check out the files, shelve the files).