To be precise, "the reformed Egyptian" is not a language, but the term used by the Nephites for characters based on Egyptian writing. (See Mormon 9:32.)
Since we do not know exactly what this reformed Egyptian was, we cannot say whether it was used to record texts other than the Book of Mormon.
Really? You send "Dear Reader's" to Mormon 9:32??? To get the truth??? Are you kidding me? Nephites??? Who are these guy's?
That's the official answer? LDS, Inc. must be stuck here. Changing the BOM...has been easy for you all...but this little part ain't so easy is it.
Unbelievable....
To find out what the Book of Mormon says, it is not unusual or unreasonable to read the Book of Mormon itself.