Hello is it possible to have a safe zone for similar trades so people can't just kill each other in this particular area ?

Hello можно ли иметь безопасную зону для подобных сделок, чтобы люди не могли просто убить друг друга в этой конкретной области ?

Its possible yes, but not now. Needed hook doesn't work at the moment.

Good!

For now I would suggest using SafeTrade plugin which provide simple chat commands to trade between players without any risks.