WIll try to do as much as I can, off the top of my head... which means it could be wrong, however best shot:

The default RPC port is 8338

Min Tx fee, never really got worked on by me, pretty much standard bitcoin v0.9.3 code I think.  After our discussions months ago, seemed consensuses was to leave it as bitcoin v9 had done, allot of stuff changed between v8 and v9 there.   We can certainly work on hard coding something specific now, if that is what is wanted, I argued it should be enforced back then, although now we're really starting to taste the reason why we must move towards an enforceable minimum.
 
Estimated block time, hmm got me there, would have to look that up.  iX coin has ten minute block target times

the daemon file is called ixcoind.exe on windows and simply ixcoind on linux

Linux versions I now build, have a configuration directory path of /home//.ixcoin
...in which all the blockchain, wallet and ixcoin.conf (the config file) settings can be found.

On Windows versions, the config files are called the same name (ixcoin.conf), but the path to them varies, depending on which flavor of windex your running.

We don't have a v9 version for the Mac, that I know of.  And my latest attempts to build them here just failed last night, even with the latest version of bitcoin v0.10.99 depends.  Think that without an upgrade on my debian OS, the machine can't find dependencies new enough.   It will have to be done by someone else for now, I've gotta load a new OS, on another hard disk, before trying again, takes time.   Been working hard on getting darwin to build, but it's kinda complicated to build on a Mac for a Mac, and I'm trying to do it from a linux machine.