As I said many times, ConEmu is not a shell. It is terminal application. That is why comparison with "run cmd" is not so correct...
When you run ConEmu without arguments, and single mode is forced (Quake style implies it too), what must be done in ConEmu?
For example, you have pinned ConEmu on your Task bar. In most cases, pinned program (shortcut) will not have any arguments. And what must be happen when you click your shortcut on Task bar? ConEmu window must appears. But if each time you click shortcut new tab will be created... weird result will be observed. Instead of minimize/restore (or hide/restore, or slide-up/slide-down) user will get new tab per click.
So, you need to run proper command to tell ConEmu what do you exactly want. Example:
conemu -single -cmd cmd
On the other hand, there are handy features DefTerm or AutoAttach. Where to know about them? In the project wiki of course. For example, if you turn on "Default terminal", you may just run
cmd from Win+R and new tab will be created in your ConEmu instance.
At last, there is no IRC channel. I'm not using IRC and who will answer there? There are many other ways to communicate: Twitter, Mailing list, Issues.