Regarding the Safe Fall skill, isn't it set so that a fall which would hurt you levels the skill regardless of whether your skill is high enough to negate all damage? If so, Kelethin has a bridge leading away from the rogue's guild which might be perfect; it consistently does 1-3 damage when you jump off it onto a handy platform below, for a nice safe training environment and a fairly short run back to the bridge. I often jump down from this bridge as a short-cut to the lifts.
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