What do you mean by exploits and hacks?
Before we go there though, if you think you will be safe behind walls, then think again. No walls will keep you safe. What will keep you safe is the skills to defend yourself, as well as the skills of your guild mates to keep you safe.
The game also has a fairly punitive alignment system, where killing someone who is 'red' will inflict real pain on them. Especially with a 1x skill multiplier and low end food. I had forgot how painful leveling up on a 1x server can be. Now imagine loosing 200+ points in skills because 'Your A PK'.
Anyhow, back to the use of 'exploits' or 'cheats'.
This is a game of PvP. Some of the current in game tactics for getting over walls will go away, but will be replaced by other, intentional, in game tactics. Climbing is supposed to be in the game (
search on the word climbing in this FAQ). Ladders will be added to the game (again, search the FAQ).
Currently it is possible to jump on the back of a horse, and use the skill 'pounce' to get over a stone/pallisade wall. It is also possible to use the terrain to jump over a wall. Finally, the one that seems to bug people the most is the ability to use a floating log(s) to get over a wall.
IMO, any in game mechanic used to get over a wall is a legitimate tactic. Even floating logs, as these have to be carried in much the same way someone would carry a ladder, or a chest, or a host of other in game constructed items that could be stacked/floated to allow a player to get over the walls. If you disagree then you should post it on Mantis as a bug to be fixed ( I quickly searched but only found a single issue about palisade walls not actually being pointy).
To reiterate,
I'm not trying to argue about what is an exploit/bug/hack, just trying to point out that what you consider cheating is not cheating in the eyes of other players. I couldn't really care less as I'll play the game either way. I will go back and point to my first paragraph that in a game of PvP, the only true, safe game play will be found in towns/villages with dedicated soldiers who are 'on guard' against would be criminals.
That, IMO, is what practical role-play is all about, and why LIF is so much fun to play.