I have installed xinetd on the AIX boxen, we have, a few modications (really additions) to the smit scripts and it's all done.
I even have installed xinetd on RedHat 6.2 to help harden it a bit.
UNIX people (me included), have embrace these changes in the UNIX industry that are good for it. Change to increase a machines survivability are needed. Anything to help keep the administration lower and keep out the handle-jigglers, is needed!