Spring RTS Engine

Would it be possible to create a widget (and or accompanying gadget if need be) that allows for players units that are being transported by an ally transport to be unloaded from the transport, so the player does not have to rely on the ally to use the unload command? Or is this currently not do able due to engine restrictions?

There are no related engine restrictions that a gadget couldn't override however it doesn't really make sense to implement. Unless your units are going to leap out of a moving plane it would require giving an order to an ally unit which in turn would give rise to annoying complications like:

* You force a transport to land or slow down when it is in danger, getting ally's transport destroyed.
* You set an unload point at a distance away from the transport, causing transport to move into danger.

Of course you could add a whole lot of complicated rules controlling when/how these orders take effect but at some point you've created a process more complicated, exploitable or troublesome than just telling your ally to please unload your units or give you the transport.

to attach units to each other from gadget, magnetic BA does this:
Spring.UnitScript.CallAsUnit(unitID, Spring.UnitScript.AttachUnit,attachpiece, passengerID)
for dropping I guess this would work:
Spring.UnitScript.CallAsUnit(unitID, Spring.UnitScript.DropUnit , passengerID)

it wont be for air transports, and maybe a speed check can be done before drop off.

But from what I understand you are saying it would be possible to drop off player specific unit just by using their passengerID's without dropping the whole rest of the loaded units off?

Interesting.

drop off player specific unit just by using their passengerID's without dropping the whole rest of the loaded units off?

did not test but that is what I would expect from DropUnit, yup.