haha yes I am... well at least i try to be one. What is your interest in these questions? they are very detailed!
Did a youtube search and came up with this.
It is only a microsoft flight sim vid (and is not mine) but illustrates the point. Thrust does not need to be at idle to activate A.floor. I have done it myself in full flight sims a few times (normally associated with a gpws manoevre which requires full backstick and manually selecting toga, which is quickly replaced by A.floor (also toga)) but obviously never in the real aircraft.
The actual stall speed is always below V.a.max. At A.floor you still have a reasonable margin above the stalling AoA.
Your question - answer is the second one. You cannot stop it giving you TOGA and can only get out of TOGA when AoA is above A.floor. That is if you have protections... if you have some failures that put you in alternate law without protections then you will not see A.floor at all.