1: Adding a spectator will not cause desyncs. If that is happening, you are setup incorrectly or not following directions properly.
2: in the DC-netplay branch, you just right click games in the gamelist to host. If it's not in the game list, then that's the problem. If it is and the older versions don't show it but newer ones do, again, we don't support older versions of dolphin. I know Netplay has been weird with non-NTSC games in the netplay men, sometimes they just show up at garbled text in the non-DC-netplay branches.
3: You wrote a lot of text, so I'm trying to scope out the questions. If you can't host on non-DC-netplay builds, that's because you're port is not open properly. That's all there is to it. On the DC-Netplay branch, there is a small number of routers that do not support the automatic port forwarding. It is currently being worked on.
4: Seriously, if the DC-netplay branch doesn't use the special netplay game list, that's why. Also, if it's a Wii game (I really don't know) Also, if the game isn't supported in the DC-netplay branch, you can still play it on single core in the branch and test out the specialized hosting features. DC-netplay does not work with every game, many black-screen/fail to launch in the current setup.
5: Screenshots of their gamelist, your gamelist, netplay host list, etc. may help us diagnose what's happening. Again, if I missed any of your questions I'm sorry, but I read through your post twice trying to pick everything out.
2: in the DC-netplay branch, you just right click games in the gamelist to host. If it's not in the game list, then that's the problem. If it is and the older versions don't show it but newer ones do, again, we don't support older versions of dolphin. I know Netplay has been weird with non-NTSC games in the netplay men, sometimes they just show up at garbled text in the non-DC-netplay branches.
3: You wrote a lot of text, so I'm trying to scope out the questions. If you can't host on non-DC-netplay builds, that's because you're port is not open properly. That's all there is to it. On the DC-Netplay branch, there is a small number of routers that do not support the automatic port forwarding. It is currently being worked on.
4: Seriously, if the DC-netplay branch doesn't use the special netplay game list, that's why. Also, if it's a Wii game (I really don't know) Also, if the game isn't supported in the DC-netplay branch, you can still play it on single core in the branch and test out the specialized hosting features. DC-netplay does not work with every game, many black-screen/fail to launch in the current setup.
5: Screenshots of their gamelist, your gamelist, netplay host list, etc. may help us diagnose what's happening. Again, if I missed any of your questions I'm sorry, but I read through your post twice trying to pick everything out.