Issue with Rex playback in sonar platinum

I'll check out how some other DAWs handle REX files, but please remember that a REX file is a combination of audio and MIDI, where MIDI controls the playback of the audio slices. Even Reason, which is made by the company that along with Steinberg invented the REX format, uses a player to play back REX files.
 
If you create a Simple Instrument Track in SONAR with the RXP, then you can drag the RXP note symbol into the MIDI track to access the MIDI data that controls the audio.Then you can simply close the RXP GUI, because the MIDI clip, not audio, is what you would cut, paste, copy, and otherwise manipulate to alter the audio slices being controlled by MIDI. So now you are working with REX files playing back as intended, in a single track. You can do something similar in Kontakt so you can manipulate Kontakt's REX file audio on the track level.
 
The other option for working with a single track is to render the output from RXP or Kontakt as audio, either by bouncing or by doing synth recording into an Aux track. Then you can cut, paste, copy, loop, etc. the audio file because it will be playing the REX file back correctly, having been rendered from a player.
 
I think at least for now, either of those approaches is the closest you'll come to dealing with high-fidelity REX file manipulation on the track level because SONAR does not have tracks that are a hybrid of audio and MIDI - audio tracks are only audio, and MIDI tracks are only MIDI.
 
One way to do what you want would be if Cakewalk created a special "REX Track" where dragging a REX file into this track type would load the audio invisibly into a "dumb" REX file player, and then what you actually see would be the MIDI file controlling the invisible player. But you can come close to that now: Set up RXP as the default in the "Add Track" instrument tab, drag the REX file into it, drag the note icon from the RXP into the MIDI track, then close the RXP GUI and cut, paste, copy etc. the MIDI clip.
 
The reason why Acidized files can be manipulated directly is because of the metadata they contain, which controls the cross-fading and stretching of slices on playback. These are purely audio techniques that do not involve MIDI and therefore can be handled within an audio track level. That is only one of the reasons I prefer Acidized WAVs.