You can't change the type of multiswitch.
The SWiM communicates what it is during boot.
You'd need to have no connection for an option to change.
Once on the SWiM switch, the dish/LNB choice is merely what SATs at there.
The DSWMLNB has support, but unless you find an option for the DSWM13, the receiver isn't going to know what to do with it.
"I guess" the only way you'll know is to get a DSWM13 and try without the DRE firmware.
It's not like I haven't talked to the STB folks about this.
The receiver knows how to talk to a DSWM switch - it must if it is able to talk to the one inside a DSWM LNB. What you're saying is that because there's not a third switch type option, "DSWM", there's no way to tell the receiver it is connected to an external DSWM switch, i.e. the DSWM13. I suggested if you configure the receiver for a DSWM LNB it may not know/care about the difference - based on the fact that the difference between a SWM LNB and external SWM switch does not matter to the receiver.
I think what it comes down to is this: Is the DSWM different enough that it needs a third switch type choice, or is it still "SWM"? SWM 2.0, if you will. As you know, I configured a receiver for a DSWM LNB and it worked just fine connected to a SWM16. The info screen said it was a Slimline-3DS, so the setting took. Does that mean the protocol is backward compatible? Perhaps. Or maybe when the receiver starts up and inquires about what it is connected to it finds it is connected to a regular SWM and treats it as such. There's no way to know from that experiment, all I know for sure is that it doesn't completely fail as it does if you configure for SWM when connected to a legacy multiswitch or vice versa.
Now, if you've talked to the STB folks and what they've told you makes you certain that configuring a receiver for a DSWM LNB isn't good enough for it to talk to an external DSWM switch, despite that being good enough in the same situation for a SWM LNB, then obviously I accept that - those guys would know. Not that I wouldn't still be curious to know why - when something goes against your expectations you always learn much more from the "why" than when something matches your expectations.
I'd love to be able to try the experiment, but unless I win the lottery I'm not going to spend $185 for a toy to experiment on for 10 minutes