I too have this same problem it apears that Jedis and I run our guilds quit the same and come up with the same ideas.
I put in this request on the phone when we were raiding Karazhan on a regular basis with 3 groups. When group 2 would upload their data it would bump group 1's items completly off the list. again when group 3 would upload their data it would bump group 2's item's off the list. Our guild members really enjoy going to find out what others received in the raid and congratulating them, with this problem it makes it very difficult.
We are again getting to that level where we will soon have 2 groups going throgh Naxx and I am sure we will again have 3 groups. with a limit of 10 Last Items Received you can easly over fill that from 1 run.
I like the Idea od tracking by date and time of the run. But it would also be nice if we could assign it to a seperate window for the specific group name doing the run.
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Houdinii@Khaz'Goroth
Stormwind Magic
stormwindmagic.com