OP is DSM-5 Alternate Method... the others (ICD-10 and DSM-4) look pretty similar really. Except ICD-10 has them split up with impulsive type and borderline type /smack forehead.

My problem is with including pathology in primary criteria for both DSM-4 and ICD-10. I believe ICD 11 will clear this up by doing a top-down method, but I also think it is the wrong direction to classify all PDs in one category together. But again, as we can't see this new method yet we'll have to wait and see.

As for comorbids, nothing stops DSM-4 or DSM-5 from properly diagnosing them.
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ICD 10
ICD-10 Criteria for Borderline Personality Disorder

F60.30 Impulsive type
At least three of the following must be present, one of which must be (2):

• marked tendency to act unexpectedly and without consideration of the consequences;

• marked tendency to engage in quarrelsome behavior and to have conflicts with others, especially when impulsive acts are thwarted or criticized;

• liability to outbursts of anger or violence, with inability to control the resulting behavioral explosions;

• difficulty in maintaining any course of action that offers no immediate reward;
  unstable and capricious (impulsive, whimsical) mood.

F60.31 Borderline type
At least three of the symptoms mentioned in F60.30 Impulsive type must be present [see above], with at least two of the following in addition:

• disturbances in and uncertainty about self-image, aims, and internal preferences;

• liability to become involved in intense and unstable relationships, often leading to emotional crisis;

• excessive efforts to avoid abandonment;recurrent threats or acts of self-harm;

• chronic feelings of emptiness.

• demonstrates impulsive behavior, e.g., speeding, substance abuse

DSM-4 Revised
http://behavenet.com/node/21651

A pervasive pattern of instability of interpersonal relationships, self-image, and affects, and marked impulsivity beginning by early adulthood and present in a variety of contexts, as indicated by five (or more) of the following:

(1) frantic efforts to avoid real or imagined abandonment.
Note: Do not include suicidal or self-mutilating behavior covered in Criterion 5.

(2) a pattern of unstable and intense interpersonal relationships characterized by alternating between extremes of idealization and devaluation

(3) identity disturbance: markedly and persistently unstable self-image or sense of self

(4) impulsivity in at least two areas that are potentially self-damaging (e.g., spending, sex, Substance Abuse, reckless driving, binge eating).
Note: Do not include suicidal or self-mutilating behavior covered in Criterion 5.

(5) recurrent suicidal behavior, gestures, or threats, or self-mutilating behavior

(6) affective instability due to a marked reactivity of mood (e.g., intense episodic dysphoria, irritability, or anxiety usually lasting a few hours and only rarely more than a few days)

(7) chronic feelings of emptiness

(8) inappropriate, intense anger or difficulty controlling anger (e.g., frequent displays of temper, constant anger, recurrent physical fights)

(9) transient, stress-related paranoid ideation or severe dissociative symptoms