Just use

# from pywinauto.SendKeysCtypes import SendKeys # old for pywinauto==0.5.x
from pywinauto.keyboard import send_keys

send_keys('some text{ENTER 2}some more textt{BACKSPACE}', with_spaces=True)

Docs: https://pywinauto.readthedocs.io/en/latest/code/pywinauto.keyboard.html

P.S. SendKeysCtypes was renamed to keyboard in pywinauto 0.6.0+.

You can simply use wait/wait_not methods for WindowSpecification object:

from pywinauto.application import Application
app = Application(backend="win32").start('executable')
app.WindowSpecification.wait('enabled').type_keys('%i') # % - alt, ^ - ctrl

WindowSpecification can be set with more details:

app.window(title='Title', class_name='#32770')

All possible parameters for window() method are the same as for find_elements function (this low-level function is not recommended for direct usage).

For long operation you can set timeout for single wait: wait('enabled', timeout=20) or set timeout for every wait globally: Timings.window_find_timeout = 10

EDIT: call this code after import pywinauto to disable logging:

import logging
logger = logging.getLogger('pywinauto')
logger.level = logging.WARNING # or higher

Logger levels:

Level Numeric value 
CRITICAL 50 
ERROR 40 
WARNING 30 
INFO 20 
DEBUG 10 
NOTSET 0