We actually have an IRC channel, but no one uses/used it, so it's pretty much abandoned I think. It's on Freenode under #EclipseMC if I recall correctly.
For the HTML block stats page, it's strictly for what you see. If you want all stats, you can export to CSV, which is a link at the bottom of the page, or the API has all blocks.... I don't think I limited the API to the last 50 blocks.
Ah, that is too bad no one uses it. You could try to add it to some places on the website/OP in this thread so people know it exists. Maybe if the average hashrate goes up a bunch, more people will be mining and hangout there. I know other pools have channels where a decent amount of people idle in. Some also have bots that announce when a block is found, next difficulty estimates, etc. I find you can usually figure out answers to questions faster with instant messaging rather than forums or email.
If the "Totals" row is only what for what you see, it is a somewhat worthless stat. So what if for the blocks on that particular page the DGM scoring method has given me +2% extra than proportional if the reality is that in all blocks I have participated in I am actually at -5%. Maybe I am the only one who would get use out of this, but having multiple pages for older blocks would be cool. At this point I don't think it would be that big of deal because it would be like four pages max. Or you could do one long page with a link to it around the Export CSV.