I would love to see some crocodiles and/or their relatives in the game! I'd also really like to see some phytosaurs or one of the huge, predatory amphibians like Prionosuchus that would probably act like a crocodile, but I know they're much less likely.
These are some very nice picks! I personally would prefer Sarcosuchus since it looks less like our modern species, but would be happy with either one.
I love the idea of adding Simosuchus and it might be my favorite of the four, but might agree with Dinotracker that it could be too small. Armadillosuchus could be a great alternative with its larger size, omnivorous diet, and incredibly armored body. Chimaerasuchus could also work, as it is a close relative of Simosuchus that is a little bigger.
These are also great suggestions! Personally, I have no issue if they add species either known from incomplete fossils like Pyroraptor or only immature individuals like Dryosaurus so I would love to see something like Stomatosuchus, but I understand why you may not want to include them in your suggestions.
A great alternative to Kaprosuchus could be Stratiotosuchus, which is known from an almost complete skeleton and was likely bigger than Kaprosuchus. You could swap out one of metriorhynchid crocs in the pack for it, which would give you one highly aquatic species, one highly terrestrial species, and two species somewhere in-between.