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Hey! I love how you've made this mod so simple yet so intuitive. After reading some of the comments regarding it (and how you're a new developer) I don't want to rush any ideas, but I'd like to suggest some new features that would make the mod better.

1. A simple text document included in the .zip file explaining people how to install the mod and its features (simple enough but a lot of people don't fully read the description and may be confused on how it functions.)
2. Some sort of phone number allowing an individual to contact someone in order to activate a hit (going into contacts and scrolling down before "calling" someone called a contractor instead of pressing f10 to activate the mod)
3. Increasing the distance of npc spawning. It would be a cool feature to have to, for example, drive a small while before killing a target. It would feel a lot more realistic than having a guarded target walking up some random hill after a police chase (happened to me, with the target being a cop).
4. Adding on to number 2, contract difficulties. A selection of different contracts, with different distances and more guards / targets depending on the difficulty of the contract. Killing some npc with a guard on a motorcycle behind them in the middle of the highway is easier than riding into the middle of grove street and causing a ruckus.
5. Some sort of highlight on who the target is. Even having them performing actions such as calling someone on a phone or smoking a cigarette would be really cool, although just a thin outline / dot would do.
6. Adding an in game config, with togglability between options such as these I've recommended would be very user friendly and a nice cherry on top for the mod.

Before you ask, I don't expect these to be done quickly, nor even know if you will try to do them. What you've got now is a great mod in itself and these are simply suggestions to my (not so very professional) opinion on what could make the mod better than ever before. I know you are a new dev and that this may be out of your ability to due, and I certainly won't be demanding it (I have even less talent than you in these things). Thanks for your time, and this mod is really cool on its own already!