Live Conferencing, capturing and maybe editing....

To those who are familiar with this...
Here is the script...
I work part time for a firm who do audio visuals for Mainly Conferences and events in the Channel Island, UK.
Most of these events require Camera work, for live projections with visual desk mixing. Each camera would have tapes in and press record when the event would start. Coming out of the mixing desk would be connected a Sony DV recorder that records live what shows on the screen.
Up until now, when clients required a DVD of the event, we would bring the tapes back inhouse, log and capture, and start editing..
Problem starts here....
The Live Mixed tape recorded is not good enough for DVD play back for two reasons.
1. for example of a pointpower presentation which would drag on the screens, would not be required on the DVD for such a long time, therefore editing is required.
2. Slides, photos coming out of PC/Mac would go through scan converters in order to fit the screen in the room. Losing the aspect ratio of 4:3 or 16:9.
SO....
We have come to the conclusion that what ever is mixed live for the screens is not good enough for the DVD, and we need to edit for DVD seperatly. Cannot use the live mixed tape. We must use each camera feed seperatly for editing and the slides, PP presentations or keynote seperate...
How do we do this quickly? What I mean by quickly is, yes of course we could bring all tapes back to the studio and capture them, a series of Mac, each having a player, each capturing at the same time.....That requires time... and most events finish at 2am...
Question 1:
The idea is to Capture straight from Cameras (keeping the tapes in cameras as backup) straight into a powermac. This is to save capturing time....
How do we do this?
Question 2:
FCP support Multicam editing. But as far as I understand it, this is only post production. Or is it not? Can we edit live straight from the camera feed?
Question 3:
Would a capture card slove our problem? something like a blackmagic decklink?
The last option we have left is to invest into a new Visual desk, split the feed from the cameras, and create a second mixing/editing desk, first one being for live projection, and this second new one being for DVD production, mixing using a visual desk, recording this to tape, being left with only one tape to capture which will still need a few twicks to fix on FCP.
What do you reckon?
I know this is a long thread, but trying to be as clear as possible....
Thanks in Advance...
Regards
Steph
G5, D2.0, 5G-ram, 250GB500GB500G lacie+ 300 Maxtor, X800XT, 30'' display Mac OS X (10.4.8)

thank you all 3 for your replies.....
I sort of knew the answer to my own questions but was hoping for some sort of magic trick to sort our problems....
Yes those conference, ball, events are important... big budget, big nights.... But thats no problem... it is turning around the job quick that is difficult.... and hte more time consuming is capturing....
I have more ideas now on how best and quick to do the job....
Picture ready is over budget I am afraid....
Thanks again...
Steph

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