The upgrade does not have a ranged icon. Does that mean the action can be used while engaged?

and if so can it be used against the engaged unit?

I belive so. Range 1-3 includes range zero.

Can a unit with 2 storm sorceresses and simultaneous orders use both?

Maegan gives all infantry the ability to take a sorceress in addition to its available upgrades.

Does a 2nd sorceress qualify as "another ability" for simultaneous orders?

I believe

3 hours ago, Darth Matthew said:

Can a unit with 2 storm sorceresses and simultaneous orders use both?

I believe so.