The skill doesn't need in-game social controls, because the Alliance has out-of-game social controls AND the skill has built in rules controls as well.
For starters, it is a role play only skill. Let's be absolutely clear on that. It can not interfere with mechanics. Even if you make someone hiccup with everything they say and do, that can't interfere with spell chants, magic item usage, damage verbals, or anything similar. Additionally, for most of the curses, the recipient chooses the severity (the physical curses are pretty much the only exception).
Second, the curse is designed to embarrass or hinder a CHARACTER. If the curse would make the PLAYER uncomfortable or embarrassed, the recipient of the curse can insist on a different curse. That is the built-in rules control.
Finally, the Good Sportsmanship rule still controls the use of this curse. If you chain curse a character, you are likely making the game un-fun for the player. That isn't acceptable. In fact, just about any unreasonable use of this ability almost certainly falls afoul of the Good Sportsmanship rule.
The references to gypsies using it in the description of the skill are primarily an artifact of the fact that the skill was created when only gypsies could learn the skill. If you look at the examples of Resist Magic, Resist Fear, and Resist Necromancy, you will note that Dark Elves, Barbarians, and High Ogres are used in the examples respectively. Even though we have had edition changes, the majority of the text in this book was written before Wylderkin were allowed to pick two racials freely.
Finally, if you really feel that only rules matter, allow me to point at the description of Wylderkin in the Rule Book.
Wylderkin possess a special advantage
over the other races. A wylderkin can purchase
two racial abilities accessible to any other race
(as long as these skills require a Build Cost; in
other words, they can’t buy “mental abilities”
or “half cost for archery”). This means no two
wylderkin, even of the same kin, are necessarily
alike.
That paragraph is VERY explicit about what they can and can't buy. It even explicitly points out racial advantages that can't be chosen. If the writers intended to exclude Gypsy Curse, it would have been excluded in that paragraph. So, you CAN know the intentions of the writers. And, the words are written in black and white. ANY two build purchased racials are fair game. Arbitrarily refusing to even consider a Wylderkin character with Gypsy Curse as a racial is a violation of the spirit of the rules and the intention of the writers.
-MS