There are 2 patches for centericq-4.20.0. First is for history reversing/full screen history and show/hide nicknames in history. The second one is for cycling through chat windows.
Created attachment 50870 [details] centericq-4.20.0.ebuild with a new USE=icpatches for adding the two patches
Created attachment 50871 [details, diff] history patch
Created attachment 50872 [details, diff] chat cycling patch
Upstream development is dead.