Out of the options, and what you are asking for, HotKeyNet seemed a good match, and Octopus. Synergy and Input Director may work, and AFAIK are still actively developed as mouse cloning is not the primary function.

HKN, may be no longer be developed, but as an avid Win7 user, it should still work for you. It also works on Win10, although there were some recent annoyances that required workarounds.

Inner Space (the bit you pay for when using ISBoxer), as a general rule does work with Anti-Cheat/Hacks, because they don't appreciate the method it uses to connect to the game. It does depend on which one in particular, but GameGuard, Hackshield, XignCode, Xtrap, GepardSheild, and the odd custom one are known to cause issues. A look at the http://isboxer.com/wiki/Supported_Games shows that Red Stone Online (your game??), probably wont work with Inner Space.

Otherwise, it's off to the oracle of google