Contrary to popular belief,the Lizardfolk Whipmaster...

[Protoss119]

But then again, you can't remove the Bonus Feat: Disarm (Whip) from all the standard whips without having to Edit Copy. Since the standard polymorph.2da makes it so it uses only the standard Lizardfolk Whip...

And what about the occasional sneak shifter?

Q: Sneak Shifter? WTF?

A: Yeah, Sneak Shifter. Going Rogue/Druid/Shifter while spending points on Hide/MS. Sneak Attacks catch enemies flatfooted, and non-DEX builds will certainly be victim to the Disarm.

[Felonious Monk]

Well, there is a way to get into the standard BW items and creatures and edit them without having to Edit Copy, but it probably wouldn't be practical. Still, Edit Copy to it_crewpwhip and it_crewpwhip2 and then edit the 2da accordingly, like you said. Single player modules would be affected (unless they use haks that override polymorph.2da, like CEP or PRC), but even if Al still plays SP NWN mods as a shifter on the same box that hosts EB, he can just take down EB and pop the 2da out of the override folder while he does so. I don't think that will be necessary.

And my shifter build is a "sneak shifter". I can't imagine a decent well rounded shifter that isn't, although monk is still far superior to rogue. The problem is that even if you catch your target flatfooted, the only ones that really hurt from it are DEX builds. Non-DEX builds lose next to zero AC when flatfooted, and typically have more than enough Discipline to avoid the Disarm even if it hits. DEX builds are hurt pretty bad if they don't have Uncanny Dodge, otherwise they lose the same or even less AC than the non-DEX builds. Even then they can usually grab some Discipline by multiclassing.

A level 20 shifter in LW shape with 15 BAB, a +3 or lower weapon, and +6 to STR from items and spells will have an AB of 24. Once you take away 6 for Disarm, it goes down to 18. The only thing this will hit at that level is a flat-footed DEX char with no UD, which is typically either a monk (which doesn't even need weapons), ranger, or bard, all of which have Discipline as a class skill. At level 20 this will be around 24-25 on average without any skill boosting items, meaning if the target rolls higher than 13-14 they can't be disarmed (9-10 if they have a medium weapon). In fact, the average roll on a d20 (10.5) will only be good enough for the attacker to beat the target if they roll a 5 or less. Even under the best conditions, disarming just doesn't have a respectable success rate for a shifter.