of course there are various boot params to try as well if you have a look at the bootscript.

Many of them don't work as the resources for the rooms weren't included in the demo.

The numbers labelled with '?' don't have their rooms included in the resources.
You can still see what items they add when you run scummvm with -d1 or you could just look at the bootscript

123 - Laundry with Laundry claim ticket
213 - ?
333 - ?
353 - ?
408 - ?
409 - stans with nails and hammer
415 - ?
456 - woodtick
459 - ?
494 - ?
498 - hotel with voodoo doll and pins
500 - largo's room with bucket-o-mud
596 - ?
598 - monkey playing piano with 11 pieces 'o eight, banana and temporary library card
619 - ?
666 - cutscene where you talk about the wanted poster on Phatt Island
667 - Phatt Island wharf
668 - ?
669 - ?
675 - ?
676 - ?
677 - ?
704 - ?
707 - ?
714 - ?
726 - ?
818 - in kitchen with trapped, cowering rat
819 - in bar
820 - in woodtick
878 - Phatt Island wharf with small key
888 - ?
890 - Booty Island with 6112 pieces o' eight
898 - Phatt Island wharf with leaflet
899 - Booty Island with 276 pieces o' eight
906 - ?
907 - ?
908 - ?
909 - ?
989 - Boot Island with 6112 pieces o' eight and shipwrecks book
996 - ?
997 - ?
998 - ?
999 - ?
1000 - ?
1001 - ?
1297 - ?
1967 - ?
1968 - ?
1974 - beach on scabb island with paper
1976 - ?
1977 - ?
1984 - Scabb Island after campfire scene
1985 - ?
1989 - ?
1990 - woodsmith shop in woodtick
1991 - ?
1993 - ?
1998 - ?
1999 - ?
2001 - ?
2010 - woodtick with riches
2061 - ?
4478 - ?
6711 - ?
8811 - ?
10001 - ? start game in easy mode
11111 - ? beach on Scabb Island