OPA365-Q1: Layout Qs to use it as comparator as well as an amplifier in a circuit

A customer of ours is trying to use an OPA365-Q1 for double functionality (the schematic where all of this is reflected would have to be shared privately via PM or similar):

For one thing, they want to use it as a comparator; for another they need its output to be used as an amplifier for an integrating circuit. Because their implementation is not working and there’s deviation to simulated data, they've a couple of questions to this part:

1. Can the OPA365-Q1 actually be used as a comparator with the following estimation: 4V/us < d(Uein+)/dt < 40V/us, while Uein- is constant (approximation).
2. How big is the maximum offset from Uaus_1, if the latter should actually output 0V with respect to ground. Are there any functional dependencies to the circuit that follows at this output. If so, how can these dependencies be quantified?
3. How big is the propagation delay for a rising or falling edge (pulse) to be reflected at the output?
4. What happens, when the pulse width at the input (Uein+) is smaller than the propagation delay

Thanks and regards,
Simon