Is it permissible for the ma'mum to delay the imam's taslim on the pretext of reciting supplication?

Question : Those who delay the imam's taslim on the pretext of completing the supplication

Answer : If it is a supplication that is commanded, there is no harm, such as if one forgets and finds the imam saying the taslim while he has not yet sent blessings upon the Prophet (peace and blessings be upon him) and has not sought refuge with Allah from the four things; in that case, a dispensation is granted to him. However, if he supplicates with an extra supplication, no dispensation is granted to him. It is said that following the imam is better than waiting for the supplication you want to recite.