[RM2K3] QUESTION ABOUT BUFFS

I don't know much about the engine's default battle system stuff (coz it's lame, imo), but this article (click here) might help you.

hmm. It's been years since I used that maker, so I'm dusting off old knowledge here.
The Effect rating is the base # for spell power. More is added by the two Influences. At 10 Influence, Physical adds 1 per 2 Attack, and Magical adds 1 per 4 Magic. The range between 0 and 10 Influence acts like a fraction, so 5 Physical Influence makes it 1 per 4 Attack.
So the final spell power will be roughly : Effect Rating + (Attack/2 x (PI/10)) + (Magic/4 x (PI/10)).
Also note that this type of buff can be spammed to reach up to 150% of the character's base + gear. This means that no matter how astronomical you make the number (9999), you'll never exceed 1.5x base. Likewise, debuffs will never lower below 50% of the enemy's base.

Knowing this, balancing spell power compared to your character stats is something you, as the maker, have to do. If you want to experiment with what numbers you're getting, tick the HP box as well as Att/Def/Mag/Agi. It'll show the same number.

If you use actual status effects for the buffs, the only number you can increase the stat by is 100%. (Also, if you use actual status effects for the buffs, be aware that agility and intelligence are labelled incorrectly - if you try to buff one you will actually buff the other instead.) Because of this high buff amount, it's recommended to set a relatively short duration - like maybe 16 turns (which if you have 4 party members and 4 enemies, is about 2 turns by the user, though if you have two party members and one enemy, it'll be about 5 turns by the user). I use this method for agility buffs, mostly, since doubling agility has a pretty predictable effect compared to doubling other stats.

If you are creating a stat-increasing skill without using status effects, it won't wear off until the battle ends, so I recommend you set it smaller. You can make it a static number, but it'll get less and less useful as the game goes on. Making the stat increase by, say, 10% of the user's attack or magic power will make a nice scaling ability that continues to be just as useful as you level up.

However, I'm not sure about what Dyhalto said about only stacking up to a 50% difference from the base - I was pretty sure the player could use the buff as many times as he/she wanted, over and over. If so, I recommend basing str buffs on the caster's int, and basing int buffs on the caster's str. That way it at least won't stack exponentially. You should probably test Dyhalto's statement out, since it might be true and that would make things much simpler.

The most practical "Reload" I can think of is to simply restore 6 MP, while having the character's maximum be set at 6 MP. One bullet = One MP. There's no need to gamble on it. If later on the character gets a 30 bullet SMG, change the max MP to 30 and make Reload restore 30 MP.
It would also be practical to restore MP after battle too.