Really I don't understand all this hatred against the turn limit
As this game is supposed to work well even on low-level systems, pumping up this limit would render the waiting between turns a lot longer... can you imagine 200 turn battles in a large map with 15 nations? Heeek!
2nd, I think a not so long turn limit makes perfect sense. After all, a turn just represent a month and (unless teleportations, which still take time for magic preparatives) involves the preparatives for the equipment tents and stuff, the trip from one region to another, the battle which takes days... And it's not easy to fight and stay in a province under the direct control of the enemy - after some time, you want or not, an army has to fall back for resupplying, regathering troops, reorganize formations. And both the attacker and the defender have their right to see their reinforcements on the march from the neighbour provinces come after some time battling - they are not fighting endlessy in a limbo separed from the physic world.
As it is IMHO, the turn limit gives plenty of time for a strong attacker to kill many, many units. But if it is unable to kill/rout all of them before 50 turns, he just wasn't strong enough to do it in just one month. He reorganizes, receives the reinforcements, the defender does so, and the fight begins again.
The only minor problem came from MoD (solved) and the other few tactics - usually spells - not working as stated, with units non-retreating after their time and the defender dying. Vengeance of the Dead i.e.