Don't write off Ti screws. They work well in the right application. That would be holding one part to another where there is very little load - servos to posts, decks to posts, shock towers to chassis, gears to hubs, etc. They don't corrode and weigh about 2/3 of steel with about twice the elasticity.
However, alunminium screws will work just as well in these places, weigh half of steel, but can corrode if not anodised. It all depends on what you want the screw to do.
Bearing in mind that most Off-Road cars seems to add lead to some parts of the car, and so do most Tourers (especially the Super-Stock LiPo class) I am wondering why you need screws that are any lighter than steel? In 12th we use ally screws wherever possible to save weight.
Don't avoid something just because someone has a failure, just know the limitations of the product and don't stress it beyond that. Remember Keith Bontrager...
Strong, light, cheap - pick two!
