It is a minor adjustment to resolve the turn signal hold down issue. The turn signal cam needs to be leveled. Your shop needs to pull the steering wheel hub and move it on the splines so that the cam is mostly level. They need to start with good wheel alignment and a level steering wheel.
Our ZF transaxles take some effort to shift, and they are not a quick shifting transmissions. More so with the original -1 on early Panteras. Our ZF's are harder to shift when cold. Maybe try it again when the transaxle itself is hot to the touch after driving for 20 minutes or so.
The pedal box is very constricted. I drive my Panteras with my shoes off at this time. Some of us have sawed off the lower right corner of the brake pedal at an angle so that their shoe on the gas pedal does not collide with the brake. The brake pedal can be shifted left by 1/2" away from the gas pedal and I began working on such today. By Friday I can let you how much it helps. Kirk Evans sells parts for the pedal box to make this happen. You have to pull the pedal box to install the modification. It shifts both pedals (clutch and brake) to the left by 1/2"