Thought I should share some fast strats for the inventory.

Inventory, HOLD Down, Press Left while holding Down, Release Down and Left

Inventory, HOLD Right, Press Down while holding Right, Release Right and Down

Inventory, HOLD Down, Press Right while holding Down, Release Down and Right

Inventory, HOLD Right, HOLD Down while holding Right, HOLD Left while holding Right and Down.

SLOT 8 is just done like SLOT 7 but insteed of doing Right,Down,Left you do Down,Right,Left.