Tie lines on XCVI Qu range

As a user of SQ, AHM and Avantis, one big thing I will miss on the Qu5D I am about to install in our local amateur theatre is tie lines. As the Qu range now has 128x128 SLink and only 38 processing channels, there are 90 input points unusable ! What a waste! Please consider Tie Lines at the next major upgrade!