In my opinion, it is not the developer of the game mode who should support all kinds of point-shops, but on the contrary.

By the way, in point shop 2 there is support for Murder, thanks to which points are given for various actions. There is no support for weapon replacement in either game mode or Pointshop2.
Even more, the developers of game mode and Pointshop2 have not updated their addons on their own for a long time, they can only accept or reject the changes proposed by the community on GitHub. The most I can suggest is to contact the people in the Pointshop2 Discord channel, maybe they can tell you something.

I understand this, but I know that you can integrate a point-shop check into the mode and I even know what variable to keep, but I do not know where the lua file with the issue of knives and revolvers is located, then where the knife check is located when the maniac throws it out, etc. and that's it. if I find out, I can do it + I do not understand how created by knife and revik in murder