Equilibris - Balance Mod for Heroes of Might and Magic IV

Why not just leave it as it was?
The previous situation - bonus disappearing after stacks joined - was a bit unnatural. From the balance point of view - it was often unreasonable to join troops (which is close to absurd), resurrect them or summon them, because the movement bonus for many was more valuable then little more troops. From the roleplay point of view - if stables give troops new horses, why can't new recrutes use the same horses (with lesser effectivness for the whole army, of course)?