The addon mod that everyone was waiting for is ready, it was originally made by @Hueihuea#3852 and @SIZ_Stan#0662 who coded 90% of the actual code.
Big thanks to them for granting me the source code so I can add more features.
FEATURES
It allows you to sit, crawl, slide and lean for tactical combat with a configuration file in ModularMovements/mod_config.json.The configuration file allows you to change cooldowns to prevents spams, change the slide push force and so on.
ModularMovements is standalone it can be launched without the mod ModularWarfare.
You must be registered to download the mod.
Credit: Hueihuea, SIZ_Stan, Protoxy
CONFIGURATION FILE
Located in .minecraft/ModularMovements/mod_config.json
The names of all parameters are quite easy to understand, if you have a question feel free to ask on the discussion thread of this resource.Located in .minecraft/ModularMovements/mod_config.json