Currently if PC turns the corner and losts the sight of his follower, the last one can easily path another direction instead of following the PC's path.

Sometimes it results in awkward situations of loosing your follower in one of Terrinyo houses, for an instance. This forces player to return back in order to find his follower, spending time, wich may be critical in dungeons with high monster generation ratio.

On other side in order to avoid this, player with high movement speed have to frequently pause his movement (5), that feels very boring .

Even more, while using "w" command player can easily loose his companions sight, and again will be forced to come back in order to find him. This makes "w" command very uncomfortable for PC with followers.
It doesnt break game by any means, but anyway, all this stuff seem redundant, awkward and sometimes frustrating.

Suggestion: i see few ways of working this out (one of theese, or all of them)
1) enchance followers movement speed to match that's of player.
2) make followers intellegent enough to follow PC even without seeing him, instead of random roaming.
3) make special command to call follower from afar. The follower will then path right to PC instead of making weird lapses in the empty room.

Implementing all 3 changes will make followers more appeal to play with (bards and necromancers rejoice!)

Talking about companions AI, i also want to mention some illogical behavior in concern of attaking PC foes. Sometimes followers just stand idle for a long period (2-5 turns) while you are fighting. I dont know if this is a bug. But, while it is 'ok' for some random companions of PC who doesn specialize in followers, this is such a fail for bards and etc (please put it into discussion if you dislike it too).
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As additional feature, I want to discuss special necromant puppets suggestion:

Unlike other followers, risen dead are fully controlled by their master. They are constantly somehow connected with him. So, this make no sence that necromancer cannot assign orders to his servants, which he cant see at the moment. Yes, he is out of sight. But they still connected! Is this really necessary for necromancer to speak or gesture orders to his servants? I think it all should happen mentally.

Suggestion:
1) make undead followers to share vision with necromancer while on the same level (perhaps the follower shouldnt be too far from his master, more than 5 or 6 sqares and he will loose share vision)
2) Also I think undead minions cant just loose their master. They feel him. So they will always follow him if other wasn't ordered.
3) Unlike other followers (dogs wolfs etc.) which like to roam around PC (while PC is holding position for example), undead servants have no interest in surroundings and thus dont have to move if they stand near their master. Currently they behaive much like alive followers with their own will and hobbies =)

Hope you will like this! Sorry for my bad english, Cheers!