As I mentioned, I have a PIX Failover (Statefull failover)
And it works fine with a crossover cable.
As Yatin also stated it works fine, but indeed, in case of a real hardware failure, when you are running LAN based Statefull failover, the failover unit will see the line protocol go down on the cross-over cable, and you could have a problem. That´s why Cisco advises to use a switch in between.
But, if you use the PIX Serial failover calble, and a crossover cable for the Statefull failover connection (as I do) there will be not such an issue IMHO, cause if the primary unit fails, the failover unit will see this happening via the serial failover cable (if configured correctly of course). So, the failover unit will become active, but the interface, which the crossover cable is connected to, will remain in state waiting, but that´s not important then :-)
Allready had a burndown of the primay unit and customers did not notice a thing, so, I haven´t been screening it, but it seems to me it is working as it should. If you want I can send you the part of my config, so you could check it out.
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The following licenses have been activated on my router :