Funnily enough thats how i do it. Here's how to make the cuesheet.
Copy this to notepad.
FILE "TRACK01.ISO" BINARY
TRACK 01 MODE1/2048
INDEX 01 00:00:00
FILE "TRACK02.WAV" WAVE
TRACK 02 AUDIO
PREGAP 00:00:00
INDEX 01 00:00:00
POSTGAP 00:00:00
FILE "TRACK03.WAV" WAVE
TRACK 03 AUDIO
PREGAP 00:00:00
INDEX 01 00:00:00
POSTGAP 00:00:00
FILE "TRACK04.WAV" WAVE
TRACK 04 AUDIO
PREGAP 00:00:00
INDEX 01 00:00:00
POSTGAP 00:00:00
Extend it for however many tracks you need. Make sure you have your files labelled "track01.iso", "track02.wav", "track03.wav" etc.
Save the file in the same directory as cuesheet.cue then follow supergrom's instructions. And for gods sake uncheck "hide extentions for known file types" it does help!