please try (not tested) : 
register_form[0].insert(-1,TR('', Recaptcha(request, 
PUBLIC_KEY, 
PRIVATE_KEY, 
error_message = 'Invalid verification', 
label = 'Verification', 
options = 'theme : "white", lang : "en"'), ''))

ref:
http://web2py.com/books/default/chapter/29/09/access-control#CAPTCHA-and-reCAPTCHA

best regards,
stifan

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