Kirr will be running around with 5000 MP. If something like this is to be implemented, the MP regeneration should be the same for everyone, regardless of their initial MP.

That's why a percentage-based system is needed, because it's not always possible to find gloves/boots, it's not always possible to maximize stats (it's risky in the late game), and therefore, the maximum possible amount of MP won't always be restored. And if we don't give a bonus to logistics specialists from their skill, then it won't be an enhancement for them; other heroes with a developed logistics skill, with artifacts, and with stat boosts will receive the same amount of MP regeneration from using the spell and will travel exactly the same number of additional cells. And the fact that logisticians already have a logistics bonus and can travel further by that amount – well, that's what logisticians are for; nothing will change.

P.S.: I wasn't the one who suggested transferring an army with a spell.