I personally didn't combine any Dual Received time and SIC in the app from my earlier stages of flight training, simply because they didn't ask for Dual Received entries and there is an actual difference, by FAR definition, between Dual and SIC. As for combining C-152, 172 etc I don't think that will matter one bit, but I could be dead wrong. When you look at the aircraft drop-down list in the app, there are a few inconsistencies when selecting "types". The Airbus time drops down as one selection, as A319/320/321 which was nice. But when you look for the RJ types, it is broken up under CRJ200, 700, and 900 as separate entries, but we all know that is one Type. Further examples are the BE-40 Beechjet and MU-30 Diamond jet (same aircraft) drops down as one plane, but Cessna 150, 152, 172, 172RG etc all stand alone. You might drive yourself mad going back and counting your night, and landings in a 152 vs a 172 and 172 RG and I'd be really surprised if the interviewer expected the same.
Again, just my opinion..nothing official.