So I'm looking for a way to calculate how much velocity it would require to give to the entity, to reach point X (whereas point X is player aiming origin).
I'm using velocity_by_aim and MOVETYPE_TOSS (MOVETYPE_TOSS so gravity can pull the entity down, making it more realistic).
An example in real life:
Calculating how much force it would require to throw a rock so the rock can fall on point X.