We've kind of been through all of this in your last post.
1. You are doing things the hard way and you aren't doing anything with your CD burner that you can't do 100 times faster, easier, and more precisely with a good audio editing/CD burning program which you can get for under $100.
2. There is no harm in converting a MP3 to a .WAV file. Or from WAV to FLAC or from FLAC to any other uncompressed format. Unlike analog, digital never has a generation loss unless you use lossy compression. MP3 is lossy, so going from the original CD from a studio, and converting it to a MP3 will lose data and throw it away.
3. If you know your CD players can play back your MP3 files from a CD-R, then there is no reason for you to burn them as CD audio discs. The reason you would not do this is because MP3 discs are not compatible with non-MP3 compatible players. MP3s are not CD audio discs, they are data discs. I believe that standard MP3 discs are often Joliet 9660 ISO discs or something like that...
http://en.wikipedia.org/wiki/ISO_9660
A MP3 disc is a data disc on CD.
A CD Audio disc is a specific redbook CD Audio standard system which has uncompressed audio files on the disc in a very specific format which makes them compatible pretty much universally with all CD players.
http://en.wikipedia.org/wiki/Audio_file_format
Wikipedia has some good definitions for you on the two standards you are discussing burnings discs to.
What's important to realize is that your CD players... If they get an MP3 file, they will decode that file just like your computer would. They decode the MP3 to a usable audio format, then play it back. If your computer burns an MP3 as a CD Audio, then your computer does the decoding of the MP3 to a usable CD format.
At the end of the day, the MP3 gets converted either by the PC or by the player. It doesn't matter which one. But, if you choose to let the CD player do the decoding, then you can get about 10 hours of audio onto a single CD.