Donny, I've been tellin ya for years, you need eye glasses! I can read that MFD without glasses just fine.
As for the drawbacks, no, you cannot save transpose, therefore, I just add the transpose information to the song title, and a couple button pushes later, it's transposed to the key I sing the song in.
As for the OTS, if you turn off the OTS link button on the left side of the keyboard, then you can load a registration that contains all your special voices and select them at will.
Same is true for the intro - if you want to play your own, just select "OFF" for the intro when creating the MFD file.
Now for the neatest part. You can create your own, custom MFD using your PC and Michael Bedesem's MFD View program, which is free at the PSR Tuturial Site. It's a very user friendly program that I have used many times over the years.
Now, you can also change the tempo, and this is done simply by creating a second MFD entry with the same name and a different tempo, just the same as pressing another registration button to change tempo. (gotta think out of the box.)
As stated, you cannot select multi pads in the MFD, but most of the time I rarely used them - just too much gingerbread sometimes.
With the MFD, and similar to registrations where an entire bank is utilized for a single song, the songs are listed alphabetically, however, you can also list them by tempo, style or beat. Additionally, there is a Favorites section where you can customize an MFD for specific types of jobs from your master MFD. Add to that two separate search engines.
The Yamaha MFD is a very powerful tool, and second only to full registrations when it comes to the level of power, but a very close second. It can pretty much eliminate dead time between songs, and can be used in conjunction with registrations. The song selection and editing processes are very user friendly and quick. I posted my MFD and it has been downloaded more than 1,000 times over the past two years, so I guess someone else enjoys it as well.
As for font changes for old, blind guys who are too vein to wear eye glasses, well, I can't do much for ya in that department. No line bifocals might be a good solution, though. And, I think they now can be had in contact lenses.
All the best,
Gary