Sublime commands to rotate the contents of selections.

RotateSelection.py

import sublime
import sublime_plugin

# Rotate contents of selections forwards.
class RotateSelectionCommand(sublime_plugin.TextCommand):
  def run(self, edit):
    view = self.view
    prevText = view.substr(view.sel()[-1])
    for selection in view.sel():
      text = view.substr(selection);
      view.replace(edit, selection, prevText)
      prevText = text;

# Rotate contents of selections backwards.
class RotateSelectionBackCommand(sublime_plugin.TextCommand):
  def run(self, edit):
    view = self.view
    if (view.sel()):
      nextText = view.substr(view.sel()[0])
      for selection in reversed(view.sel()):
        text = view.substr(selection);
        view.replace(edit, selection, nextText)
        nextText = text;

# Add to User keymap:
#    {"keys": ["alt+r"], "command": "rotate_selection" },
#    {"keys": ["shift+alt+r"], "command": "rotate_selection_back" }