Poskim are recorded here permitting standing specifically for the Torah reading of the Aseres Hadibros. Are there any poskim who forbid this in accordance with the ruling of the Rambam?
See Dose of Halacha who brings various opinions on this debate:
While many Achronim including R’ Moshe Feinstein (Igros Moshe OC 4:22) justify standing, R’ Ovadia Yosef (Yechaveh Daas 1:29) writes that had they seen Rambam’s responsum they wouldn’t have written what they did.
Rav Eliyashiv (Vayshima Moshe 5:pg.34) held that one should not stand for the aseres hadibros. He held that those who stand and then sit for the rest of the parsha is lessening the honor of the rest of the parsha.
Rav Eliyashiv holds that even in a place where most of the congregation stands one should still remain seated and does not have to worry about lo sisgodidu.