Honestly, personally, I think getting actor infoboxes and more information on ALL 2000+ cast is relatively low priority - it'll be great to eventually get there, but I think we need to get more solid show information sorted first. Sections like the Musical Numbers, Discography, more production information - tour dates, we're still missing loads of cast lists, let alone finding biographies for all the cast! The preformatted text is hit and miss... the way it lays out into a box is nice, but personally I don't love the font change, and sometimes it sets a scroll bar for long lines which clutters it up.
The angle I'm coming from, is what do people who've searched for information about the show want to know? For example, "My nan saw Cats at our local theatre, when was that?" so the production pages need the tour venues and dates. Or, "Our local theatre company is putting on Cats. Which role should I audition for?" - each character has the audition requirements, but also links to the songs that character features in. So each song page needs to have enough information to supply someone with the knowledge they need. Or, "I want to cosplay Bombalurina. Which is the prettiest costume version?" Each character gallery needs good examples from as many productions as possible.
There's just so, so much to say about this show!