A CRJ100 CREW DISCOVERED THAT AT CANADIAN ARPTS; A 'TAXI TO' CLRNC DOES NOT AUTHORIZE AN ACFT TO CROSS RWYS ENRTE; EITHER ACTIVE OR INACTIVE.

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I WAS RECENTLY MADE AWARE; 4 HRS AGO; OF A CANADIAN OPERATIONAL POLICY WHICH STATES THAT WHEN CLRED TO 'TAXI TO' AN ASSIGNED TKOF RWY OR TO 'TAXI TO' ANY OTHER POINT ON THE ARPT AN ACFT IS NOT IMPLICITLY CLRED TO CROSS ANY RWY WHICH INTERSECTS THE TAXI RTE TO THAT TKOF RWY OR OTHER POINT. THIS POLICY REQUIRES SPECIFIC ATC CLRNC TO CROSS EACH AND EVERY RWY ENCOUNTERED ALONG THE TAXI RTE; IS VERY MUCH MORE RESTRICTIVE THAN FAR 91.129(I); AND TO THE BEST OF MY KNOWLEDGE IS NOT DISCUSSED IN ANY COMPANY ISSUED MANUAL. I OPERATED A FLT TO CYYZ AND ATTEMPTED TO FLY BACK TO ZZZ BUT NEVER DEPARTED CYYZ DUE TO A COMBINATION OF MECHANICAL AND WX RELATED ISSUES. A SNOW STORM WAS REDUCING VISIBILITY TO 4000 FT RVR AND 28 KT WINDS CAUSED SNOW TO DRIFT AND OBSCURE TXWY SIGNS AND MARKINGS. THE FO AND I TRIED OUR BEST TO CONDUCT A SAFE AND COMPLIANT OP; BUT I WAS UNAWARE OF THE REQUIREMENT FOR SPECIFIC CLRNC PRIOR TO XING EVERY RWY AND AN INADVERTENT DEV COULD HAVE OCCURRED; ALTHOUGH ATC MADE NO COMPLAINTS. IT IS MY BELIEF THAT OTHER PLTS WOULD BENEFIT FROM HAVING THIS CANADIAN OPERATIONAL POLICY EXPLAINED IN THE OPS MANUAL.