This is a bit off topic for now, but no other Allstar node should hear your repeater IDs or courtesy tones. See CW node ID heard on connected node - #5 by wd6awp
Additionally, if two repeaters are in-band linking and leaking IDs or CTs you've got a ping-pong problem.
And while I'm on the subject of in-band linking, the audio is not as good as normal Allstar audio because there is an extra radio involved. You're dealing with all the problems of RF linking that Allstar totally does away with.
EDIT: I forgot to mention another disadvantage; the link won't be full duplex.