mderdem,
The pitot really doesn't wk below about 20 knots, so most helos (with side and rear limits in that neighborhood) will not benefit even if we pointed extra pitots in various directions.
A number of systems have been developed to provide the answer, and some oare very good. Here is an overall discussion, the autho might not have been aware that Comanche had a blade-mounted system that was excellent:
http://www.dsto.defence.gov.au/publi...TO-TN-0495.pdf