This page was translated by TheCowness using only Google Translate and my memory of item names, so the item names may not all match the official English Dragon Warrior VII translation.
My primary goal here was to make the tool easier to use quickly during a speedrun, specifically at the Past Dharma casino. I also spaced everything out a bit to improve readability, gave the page a dark background to save my Android tablet's battery, and changed some of the default search parameters.
Instructions
Load a save file and walk (Don't cast Return!) to the Lucky Panel table as fast as possible, with coins already in your pocket.
Begin a game, and reveal the first six tiles.
Place the first six tiles on the board below by clicking a tile type on the right, and the tile location on the left.
Hit Search, followed by Set RNG Seed. You may need to raise End Frame if you're walking to a further casino than Dharma's, or if you're slow. If the "RNG Seed" field didn't update when you hit Search, either you did the inputs wrong, or you were too slow getting to the table.
Under Future Rounds, select "ROUNDS 000-050". Board 0 should be the same one you input. Board 1 will be next, etc.
It's extremely unlikely the partial search will find the wrong board from six tiles, but if your Board 0 doesn't match the board in game, add more tiles and search again.
Note - for the actual odds of an item appearing, check this document.
(Google Translated) Remarks
Shuffle panel is not supported. Do not open the shuffle panel.
Do not chant Return or intervene in combat. It consumes so much random numbers that it can become impossible to identify them.
If you move to the adventure selection screen as soon as possible, the initial random number on the actual PS1 will be around 540-600, and the initial random number on the actual PS2 will be around 460-500. I haven't checked it on other units.