Making a feature where you can set a point and start from it carrying a specific speed and specific tyre temperatures (maybe load a file having these data)

The idea of this is that training with some success and failure to achieve a time benchmark takes a lot of time, having this feature in my opinion will make it much easier for racers to improve (LFS is a serious sim, I think its important to make improvement easier)

This is already possible with the licensed content access (S1 level is sufficient). In autocross editor you can place a start position wherever you want and drive from there repeatedly. Also if you insist on practicing with specific tyre temperatures, you can load the same layout file in the hotlap mode and adjust tyre temperatures in the garage (only available in hotlap mode).

That is true, but doing that will take a tiny bit longer, and the temperatures will be very even, the hard part is to train in uneven conditions, especially when the setup runs on extreme camber, training on even temperature will be decieving

I mean to have an option where you can save the position, speed, and exact temp of the tire (the 3 temperatures of the tread, and the core temperature too)

Its useful to have that for precise training, the traditional way still works but not as efficient

You really don't need that granular of temperature control for the tyres