Your board actually has 3 controller chips!
"W/O any extra steps" will be up to how you're currently configured.
It is generally accepted that any SSD drive will perform best on the ICH10R vs other 3rd party chipsets - and the ICH should be in AHCI or RAID mode off the bat for best SSD performance. If your SSD isn't currently on the ICH10R, then you might have to re-install your OS to make that happen. W7 can generally cope with such transplants, but XP will genrally puke.
The ICH10R connects to the bank of 6
RED SATA ports. 4 are "Stacked" in pairs, and 2 are behind the stacks.
Your board has 2 other controller ships: A Marvell 88SE6320 for the
ORANGE pair of "Stacked" SATA/SAS ports close to the ICH ports, and a Marvell 88SE6111 which feeds the "eSATA to Go" rear port and the IDE bus. I'd wager there are settings in the BIOS to allow the 88SE6320 to operate in AHCI or IDE mode. If in AHCI mode - you could very well use the 88SE6320's internal SATA ports for your "removeable" drive scenario w/o messing with your OS at all (assuming your SSD isn't also on that controller). I can't confirm that the 88SE6320 has AHCI capablities as I don't have a board with that chip - but your BIOS or your OM should have that info...
Seeing as your SSD will get the best performance on the ICH10R in AHCI or RAID mode - I personally would make sure the SSD is on the RED ICH10R ports, configure as AHCI in BIOS, and also connect the "removeable" drive to the ICH10R. Install the RST software and you'll be getting the best performance from both drives with full hot-swap capabilitues and no external wiring AFAIK...
Changing the ICH10R from IDE to AHCI can be problematic if your OS is installed on a drive on the ICH10R. See here for info on that:
http://www.windows7news.com/2010/05/25/how-to-enable-ahci-in-windows-7/ . I'm not sure how to do this in XP or if it's possible w/o re-installing.
If your SSD is already on the ICH10R in AHCI mode, then you can certainly leave your eSATA the way it is and call it a day. If your SSD either 1) Isn't on the ICH10R or 2) Isn't in AHCI Mode - I'd address that IMNSHO and might as well move the Removeable Drive to the ICH10R as well and loose the "loop around' eSATA connection... Use the eSATA for true external drives
Might be easy - might be a PITA depending on how you're configured now.
Isn't this fun?