yeah...the option is there in the multigameISO creator
to choose DVD5 or DVD9 so i would wadger that you can if thats your fancy
it will make a iso from your chosen backups and you can use a Dual Layer burner to burn it at 2.4x on IMGburn for best results use philips, sony dvd-R DL
some combos i KNOW work well (order matters actually! no clue why but if the games are in any other order it wont work but..
Super Smash Bros Melee+Super Mario Sunshine+Sonic Adventure2Battle = 1 single layer dvd-r
then
Gauntlet legends+Need for speed carbon+Animal Crossing = 1 single layer dvd-r
so with some experimenting you will find that games will boot better as the second game rather than first
)i dont have a clue why thats just my experience with the tool)