Most people are not effective at using ja+ moves, making this only a rare annoyance. Sure, it's not cool, because if chained correctly, they can 'stun lock' an opponent, resulting in unfair damage. HOWEVER, using ja+ moves are mostly considered a poor choice due to the temporary immobility, and difficult execution. Especially against a skilled opponent or in ffa, its effectiveness is limited; against an opponent unskilled in countering the same, it can be frustrating.
With that being said, ae and nick james are very good at using ja+ moves. They both understand that it's not generally cool but still a legal route to take. It's the same thing as staffers using kick-based styles, frustrating but not against the rules. With THAT being said, they are certainly the exception and not the rule. Few people rely on these tactics, and they are usually worse off. If you run across it, they will probably own you once, because you're expecting the normal rules of engagement. From there, kindly remark about how their use of the same is hindering your fun. These individuals are mostly skilled anyway and will gladly duel you without ja+ moves. If they are rude, or refuse to stick to the 'normal' move set, don't duel them again; there are plenty of players around. Lastly, if this happens in ffa, avoid them, wait for them to use the move on someone else, and then kill them both. Or stop FFA'ing, but that's not my suggestion.
Switching gears:
You're a nice person and everything, but I've notice you've been pretty direct on the forums with your suggestions. They generally come-off demanding. I've only been in KR for about 4 months but can tell you with 100% confidence, that is not how things work. We welcome suggestions and discussion from non-members, but not direct decisions. Even within the clan, discussions are had for everything. We restrain from basing proposals and results on opinions, because that is simply not fair, and not how KR works.
Using this post as an example, a better way of approaching a NECESSARY topic in the future would be: "I felt that ja+ moves may have been used in an abusive way by a player (do not name) the last time I was on the KR server. He/she repeatedly used the same move on me, which I could not escape. Is this against the rules? Or is this potentially considered laming? Thanks for reading."
P. S. - like this response, try to compose a post or a response, with time, thought, and care. Time - did you say everything you wanted to? Rather than having you post 3 comments in a row to convey your sentiments? Thought - is it worth posting about? Did you already review the forums for an answer? Care - did you think about your audience? If you put yourself in their shoes, is it respectful?
Thanks for reading.