key-bindings.json

[
  {
    "keys": ["ctrl+w"],
    "command": "run_multiple",
    "args": {
      "commands": [
        {"command": "find_under_expand", "args": null, "context": "window"},
        {"command": "show_panel", "args": {"panel": "find"}, "context": "window"}
      ]
    }
  }
]

run_multiple.py

import sublime, sublime_plugin

# Takes an array of commands (same as those you'd provide to a key binding) with
# an optional context (defaults to view commands) & runs each command in order.
# Valid contexts are 'text', 'window', and 'app' for running a TextCommand,
# WindowCommands, or ApplicationCommand respectively.
class RunMultipleCommand(sublime_plugin.TextCommand):
  def exec_command(self, command):
    if not 'command' in command:
      raise Exception('No command name provided.')

    args = None
    if 'args' in command:
      args = command['args']

    # default context is the view since it's easiest to get the other contexts
    # from the view
    context = self.view
    if 'context' in command:
      context_name = command['context']
      if context_name == 'window':
        context = context.window()
      elif context_name == 'app':
        context = sublime
      elif context_name == 'text':
        pass
      else:
        raise Exception('Invalid command context "'+context_name+'".')

    # skip args if not needed
    if args is None:
      context.run_command(command['command'])
    else:
      context.run_command(command['command'], args)

  def run(self, edit, commands = None):
    if commands is None:
      return # not an error
    for command in commands:
      self.exec_command(command)