Change model sexp works fine BUT when you are doing massive missions it's a ***** to FRED.
Might I suggest a "change to secondary .pof or tritery .pof" option?
So when you hear the voice say all Units switch to Guardian mode you See your wing of VT's go to Gerwalk, and the Hovertanks hover mode, ect... Any hydrid unit is listed as it's core model as primary [Model] as normal in the table, but for models that will have other modes they become seconday or tritery options... You don't need to know what each individual one is and it doesn't lock a particular unit in a mixed group into a not allowed one by defualt, plus makes mission creation with combined arms MUCH easier.
Most of the work is instead done by the tabling before hand.
ie: I am in a standard vt and hit the (2) key I switch to Gerwalk mode, I hit the (3) key I go to Battloid mode, and hit the (1) key to return to fighter mode... thsi is how it is currently Fredded and works fine BUT
What if I have other units besides VT's in my wing, now it gets compicated... the Fredding requirements go through the roof. I could end up with units using other units models by accident and mission creation goes from minutes to hours.
Also a "change Wing model" sexp would be great! Also to save time/
ie: "beta wing switch to battloid mode and begin your assualt" - you see beta wing of shadow fighters go from their current mode to battloid and take off. Instead of Freddign each individual teh wing command will change them all at once.