I've had SLI and worked with dual card setups so uhhh, yeah! SLI is enabled.
I do know that in Bad company 2 disables Crossfire when you alt tab but their latest patch fixed that.
Profiles for a game do nothing more that set the card to the optimal settings for the game specified. It cannot force SLI or crossfire onto a game that was not made to support it.
As for your 5970s, if you REALLY think the load is being shared, install MSI afterburner and it will show you that it is not being shared. The primary card is doing 97% of the work. If you can prove me wrong (and I sincerely hope you can) please provide me with the steps you took to get both cards to work with SH5
Thanks