Lowered car, different specs for tracking?

That depends on primarily two things;

1) purpose the car is intended for and, frankly,
2) how involved you want to get.

Tracking, meaning "toe", could be set to factory specs and it would almost certainly be ok ie; driveable with acceptable tyre wear. Camber may or may not cause problems but that can be more complicated to adjust if the factory didn't bother. If you wanted to go racing, or just a fast road/track day set-up, you'd want something different to factory specs depending how you want the car to behave.

Also, with camber & castor, it's almost certainly impossibile to get them to standard positions with the car so much lower without some extensive reworking with either custom fabrication or off-the-shelf, replacement, adjustable parts.

You'd have to decide if the cost of such work is worth the possibile cost of running through tyres faster than normal.