I don't know if it's just me, but with the variety of peds that are out there I find it surprising that there are so little released. I don't even know where to start when it comes to moding myself but I think it would be cool if people who knew how would like mix and match different parts from different peds and create like a new detective ped or plain clothes cop or whatever. Just a thought.. I think that would make lcpdfr even better and with all the mods coming out I can't imagine it would be that difficult to make a good one. Something like these but with a gun/cuffs/cellphone/bulletproof vest (Yes I know one of them already has one) or whatever '?do=embed' frameborder='0' data-embedContent>> ... again just a thought 

Well, you can mix and match ped parts yourself:

http://www.lcpdfr.com/page/tutorials/index.action/_/player-ped-modification-tutorials/combining-ped-meshes-how-to-mix-and-match-clothes-for-a-ped-r4

Aside from that, ped modding isn't as established as vehicle modding (the needed tools came out well after the needed tools for car modding).