I'll mess around with it a bit, maybe tomorrow. I just spent the last few hours dumping my WBFS drive to my computer so that i can make a fat32 partition and play around with triiforce on a USB device along with using a usb loader.
I will probably make it so that depending on what you select from a future version of the MULTI CONSOLE .dol, it will look in the matching location for images. It seems like there are a lot more people interested in NOT using an SD card for images. I know I would rather have them on the USB device as well because I have my 16GB SDHC card for emulators and roms, but since it's SDHC, triiforce will have none of it.
I also still need to finish my analysis of game compatibility with the various nand dump types as I seem to be encountering new issues with different dumps.
Another interesting thing I may look into doing is what those guys on gbatemp did by creating a cIOS 199 to load triiforce with (which is based off of either rev 14 or rev 15) which allows you to install rev 16 to your Wii and triiforce will still work. I would prefer if the cIOS 199 is based off of rev 14 though as there have been enough bug stories about rev 15.