Well I went through 7 pages of installed Mods & 10 pages of Search Results and a 100 of hacks saved on my HDD and I couldn't find a Modification that I lost during upgrading
It was something like 'Password Protection for AdminCP' what it does it sends you an email stating who tried to access your AdminCP including with time, IP and some extra data, it was released as a 'template mod' a couple of months ago, does somebody remember???