Hmmm so you wont lead your friends, who are lightly to be supportive and helpful on their lockout - even though it wont lock you unless you kill the boss (in which case you are sucessful). But will on LFR where people will not be as helpful, skilled, supportive, or even patient. I forsee a LOT of grief and quite a few boots coming your way.
Oh and if we do bump into each other - and you are as bad as you make it sound, dont be offended if you make my ignore list while you abuse the system to learn fights, whilst you mess 24 other people around.

Translation:

"Don't be new on my time."

You're the guy that expects raid geared tanks in heroics, aren't you? :P

While running tank-capable alts as dps, I've successfully led vote-kicks on raid-geared tanks that were either being stupid or pricks in randoms, and tanked the rest of the instance with compliments from heals and dps for doing a better job with relatively crappy gear.

The LFR raid finder will have to be relatively easy, though, IMO. Think about even a pretty easy boss like Beth'tilac with an LFR group with no voice chat. What about a boss like Baleroc where dps need precision shard soaking (maybe 25-man reduces the precision required somewhat?) And a boss like Ragnaros with so many things going on would never work with an LFR group. Even a boss like Alysrazor that's pathetically easy once you know the fight has so many moving parts that in LFR I doubt you'd actually be able to actually learn the fight.

It makes me wonder if they'll be removing entire mechanics from the LFR difficulty. It will definitely be interesting to see, and I have many alts so I can experience it as dps, tank, or heals. It definitely won't be a replacement for my main or alt raids with my guild though.

I also wanted to echo the previous poster's comment about raid leading for your friends. Wiping is part of raiding if the encounters are remotely challenging. When the encounters cease to be "dangerous" enough that wiping is only a remote possibility, then it's just boring.

That's what happened with the massive nerfs to T11 content plus the easy access to T11 gear. Our alts raid was suddenly in the position of mostly not being geared enough to do reasonably well in FL, but T11 content was faceroll easy and quite boring. Of course, the normal mode FL nerfs were bad enough that our alts raid went from 3/7 on their first time in FL pre-nerf to 6/7 on their 2nd time in FL post-nerf, with a couple people including a tank who had never even been in the instance on that post-nerf run.

So if you're unsure of trying raid leading for your friends, now is the time. Post-nerf FL is really easy up through Majordomo Staghelm. If your group is pretty new or doesn't know the fights, you still have the opportunity to wipe, but it's really pretty easy now.