How so you specify which tie you want .tieang .tielen .fixlen and .fixang to affect?
tienum. Same as for tie feeding and data transfer. if more than one tie has the same phase (address number from tienum) then all the ties with the same phase will be affected.
Is there any way of moving hard ties ie. using .fixang?
Yup you got it. fixang sets the angle of a hardened tie WRT the bot's aim direction.
Does .stifftie affect hard ties?
Yup. What it does is to dampen the springiness of the tie. it's range is 0 to 40. 0 has no damping so it bounces around for ages. 40 is pretty much rigid and allows virtually no deviation from the defined length and angle.