Such as bows, crossbows, eggs, snowballs, ender pearls, etc.

I think this may be too close to what is considered to be hacks.

I feel that this fits in with the rest of the mod - freecam is included although that could also be considered "hacks".

Projectile trajectory though is very much combat or PvP oriented. The mod is mainly intended as a utility for "normal" survival/creative play, with some focus on technical minecraft and especially building/block placing.

I know many people consider the Free Camera a "hack", and it can certainly be used for seeing stuff you are not supposed to, due to the nature of how it works. But that is certainly not the intended use case for it. The original intention for it was looking at tightly packed redstone stuff etc. where it's extremely hard or impossible to go and move around in survival mode (and that is also the main reason why I made the inertia for it different from normal Java behavior - where the motion is cancelled way faster so you don't do those annoying long glides when you let go of the movement keys, for example when you move into place to look at some specific part of redstone/other mechanics). I've also seen many builders use it for taking a quick look from a distance or just from a different perspective, or players taking a look at mobs farms running while the actual player stays in the AFK spot etc.