The plugin you are talking about and the feature you are suggesting are different. The plugin prevents gear swaps client side the feature you are suggesting would require the server not sending gear swap info to other clients based on your preference. I can see how that might be a little annoying to code. The easiest thing for them to do would be to take a page from the plugins book and allow for a setting that prevented blinking while a character was targeted. It could all be done client side and it is clearly possible because it's been done already. It would be a little wonky if for instance you were targeting a NIN using a GK and he switched back to DWing resulting in him swinging his GK about 100 times a second until you were no longer targeting him. Honestly though... who freaking cares. Losing target on blink is just as wonky.
