Reading the Ten Commandments

 Shalom! 

 Thank you for your question. 

 It is true that some sources frown upon the custom of standing for certain special Torah readings. This is the famous view of the Rambam (along with others). 

 The reason for the opposition was due to the concern that it give the impression that some pats of the Torah are mor important than other parts of the Torah. This is, of course, untrue as every story, commandment, and even every word of the Torah is equally important. Indeed, a Torah missing even just one letter is not a kosher Torah no matter where that letter is missing. 

 Although some halachic authorities, allow standing for special Torah readings, especially for the reading of the Ten Commandments where were try to re-live the experience, and we are told that the Jewish people stood when the Torah was given. 

 One should follow the congregation custom: if the congregations stands then one should stand even if one normally follows the Rambam. And if the custom is to sit, one should sit regardless of one’s normal practice. 

Hagaon Harav Fried Shelita says, that if there is no specific custom, then one should sit.