As already stated, the FAA requirement is Vs1.2 and the CAA requirement is Vs1.3. It is possible to insert your own numbers in the FMC, just not advisable!
To establish the edges of the envelope it is possible, on some software, to insert an impossible high speed, say .90 and the FMC will actually give you the maximum possible under the present circumstances, now put in an obviously too slow speed, say .70, and the FMC will give you the absolute minimum speed. Some companies inhibit some of the FMC functions.