Tesla will not offer options like dual motors, ludicrous, HUD (?) and perhaps glass roofs, cold weather packages, towing, air springs, etc initially, but they have to offer some upgrades to make a profit. What options would bring the greatest value to the company and us customers without disrupting the production line, and seem realistic.
PFF mode: Pretty F Fast. Dumps the power into the one motor, like ludicrous does. Call it the P75, 0-60 in the 4s.
Wheels: Big wheels and tires: probably part of the PFF package, but available separately.
Seating: Leather obviously optional. (Please have two or three cloth color options!)
No HUD for now? Planned for later?: Include the wiring harness and make it possible for this to be added later.
Auto Pilot: Presume they will handle this like the big cars, with full AP optional.
Lights: LED lights. Really should be standard as they are safer.
Paint: All but one or two colors will be optional.
These options are popular and easy to install components, merely bolting on one thing rather than another and mostly manufactured by others. Most likely at least some of these options would be chosen by a majority of buyers and would be profitable for Tesla without taxing the assembly line.