Mux: keep video and encode audio + subs

Hi! In most cases if not in every case direkt playback fails(prevent) because of incompatible audio and subtitle sources.
nearly every playback device can handle x264 and more and more can handle x265.
it would be FANTASITC if the optimizer would become a option to keep video source and options to encode audio to AAC and subs to srt.

is this possible?

thx