Streamlined Battling? (2x rewards, 1/2 encounters)

Yes, if earned Magic Points * Learn Rate exceeds 255, it will wrap around. For example, gaining 15 Magic Points with Bismark (Fire/Ice/Bolt 20x) equipped will only give you 44% towards learning Fire due to overflow. Coding in an overflow check is simple, but it would take up free space and thus be likely to conflict with other patches.

If you want players to learn magic at a faster rate, just increase the amount of Magic Points gained from each formation, or the learn rate, but make sure the product of your highest Magic Point gain and your highest Learn Rate isn't larger than 255.

For example, in vanilla terms: don't go higher than 12 for Magic Points or higher than 20x for learn rate.