Hi,
IOCP works in asynchronous mode only so it can’t be suitable for usual (non-async) methods where client waits result of execution.
Client-side won’t be much (if any) benefit from IOCP unless you are doing hundreds req/s from the same client (an in this case it means that you are doing something terribly wrong).
Currently RO SDK for Delphi emulates asynchronous requests via sending them via usual (non-async) requests.
Implementation of IOCP will require rewriting significant portions of RO SDK code so it can be a bit compilcatied and non-reasonable at this moment because only Grijjy library (XE8+, Windows&Linux only) supports it