Is there any benefit to having your weapons drawn while delving? From the rules it appears you can always draw a weapon (and drop something to boot) for "free" on your intiative.
I ask because I'm considering a default -1 for monster reactions to adventurers who have their weapons out. This seems reasonable to me; folk showing up in your lair/hallways with weapons out seem more likely to have ill intent.
For better or worse, this standard penalty would have the effect of making "Monster attacks" reactions rolls similar to the Rules Cyclopedia, moving them from ACKS' 1-in-36 chance to 1-in-12.
But this won't be much of a cost/benefit analysis for PCs if there is no actual benefit to having your weapons drawn.
If there is no benefit to having your weapons out I suppose that's fine, but it seems a bit odd. Of course having your weapons out and ready for ten minutes or more at a stretch creates another kind of oddity; you might expect characters to draw weapons only upon hearing something at a door just prior to bashing it down, for example.
Having a ready shield is useful and stikes me as relatively non-threatening so I wouldn't penalize that.
Another consideration: I suppose spears are pretty much going to have to be drawn if the ceilings are low. Or maybe always depending on one's campaign. I confess I don't know much about spear harnesses.