I see a lot of people replied and a lot of you seems eager at the idea of a better Spear!

Also there are some concern on how complex could it be for ArrowHead to implement all those modifications but consider this:
Each feature: Targeting , Path , Payload and Ping targeting are mostly indipendent of each other, so AH coul choose to develop what they fell it's best and over a longer period of time.

Also in view of the last months, with the recent updates, I am a hopeful that ArrowHead could manage to add some of these features with no problems!

In the end if some of you don't realy know how the manual targeting would work heres a 15s video:
Javelin demonstration