So here's what I have to offer from the last 24 hours:
As far as fonts go, the best way I have found is to install the Morkl ReaderMod found
here. The installation process is well documented.
When you have that running, use the folder titled "reader" found with the download and copy this directly to your reader when plugged into your computer. When plugged into the Mac, this partition is the READER one. Now you have a folder titled "reader" inside of READER. Inside "reader" you have an xml file titled reader.xml where you need to make your edits. This is a new file that doesn't exist anywhere else, so you're not changing anything already installed on the reader.
XML editing can be done in a simple text editor such as TextEdit on the Mac or notepad on the PC. Just make sure that when you save it saves as .xml not .xml.txt
Here's what the .xml should look something like:
I've had issues if there aren't 6 fonts listed here, so if you only want to add one, leave 5 of the stock ones and just add your new one at the bottom. Notice the difference between the code for the stock "Amasis" font and the one's I'm adding: for the new ones the path is ../../mnt/sdcard/reader/fonts/. Yes you need the periods. Ignore the fact that you're dumping these onto a partition called READER. This got me hung up for a LONG time.
Dump your fonts inside of /READER/reader/fonts/. Good examples for the T1 can be found
here. These are made for epubs, and that's what I read 100%, so that's all I currently know. Someone may be able to comment on whether these will work for other file formats. I simply don't know.
After that, you can also change the default font sizes as seen in the code above. It's the part that says "fontsizetable." There are a few that say "fontsizetableepub" for example and those change the defaults for the particular ebook formats. As I've said I only read epubs so I'm leaving out the code for all the other ones which is OK because the reader will default to the sony code for those. I'm not vision challenged so I don't need the crazy poster sizes that come default, which is why I've left the smallest "57" and only go up to about twice the default size.
Let me know if there are questions about these instructions. God speed.