Ice beam can be done as your 2nd item, with space jump that is :P but theres no way to leave. for a missile skip, we need to find a SW in or around the room with the morph ball
in the mean time, MrSpEeDrUn: can you test somthing for me, get a power bomb exp and then beat the boss for power bombs, dont get the main power bombs, then go see if the trigger is there for warrior, (you may need to use IS to hit the trigger, if there is one)
If you need any help with codes (for items or health or anything, I know a fair bit about Action Replay codes)