Try having your hero equip the pick axe and click on the cracked wall section. I don't know if it makes a difference, or not, but if you have combat mode disabled, try enabling it.
You are using the pick axe from the Raanaar corpse in that room, correct? IIRC it does not have any strength requirements, and that is not a factor in breaking the wall.
There are a couple ways you can bypass the wall, but that should be a last resort, since the game may make some updates when the wall is opened, or check for that later. It is probably save to do so, though, as that room is pretty much only used to hold a couple items.
You can get a summoning doll through walls and then have it enter the BF to get your main characters through the wall upon their return to the main game (see
armory trick in act 1).
Alternately:
Teleporting anywhere (via hex editor).
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