Hitting a skill key while targeting an enemy should perform the skill and start the fight, not tell the player it should be fighting to use it.
Have the devs played any game in the last 20 years?
The problem with this is game is, that when flash freeze for a few second, thing that happens a lot since mozilla doesn't give a f*ck about flash, instead of pausing, like almost other game in Kong, the song keep going and you can't hit anything until flash unfreeze.
Because it works well for thousands of people, who like it. Try a different browser, some browsers are hostile to the RPGMaker engine.