Actually in TMO and my TMOkeys mods there is a "will somebody identify that target for me?" function. TMO works off the button bar, TMOkeys uses shift-i.
Also, there is an estimate target speed and course button in the speed section of the TDC input screen. It's prone to error if your observations are in error. You need two stadimeter observations of range and bearing taken at least ten seconds apart, then press the button. Unlike SH3, the answer is entirely dependent on your observational work. Good luck with that!
In all, SH4 went more for realism over automatic supply of target information.