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On the other hand, gaining support of Linux and OS X is probably worth the cost of Windows XP.

To be honest it should generally be discouraged to use the good old XP nowadays. It's EOL since months (soon to be a year) and without updates potentially insecure. In my eyes the only valid reason to use it is to keep old software alive on a computer without Internet access*. It's just too bad Microsoft didn't wait for the Win10 release so users could have upgraded. May SteamOS pave the way for a bright FOSS future.

TL;DR: I must sadly agree.

*The airgap is no perfect isolation and even emulated the old software would have to be sandboxed for the same reasons XP shouldn't be used in production anymore.

The games themselves can apparently be built for Win/Lin/OSX in the newest alpha release according to the 3.4.x post, that's already a common base for multiplatform.
The editor itself is Windows only because of the .net parts if I researched correctly.
Attempts at using mono seem to have been made but I don't see them in the downloads section yet so It doesn't seem like the recommended practice to me.
What exactly would be needed to simply take the editor code and let it compile a Lin/OSX-build that can do the same?
I'm asking primarily because Microsoft now open-sourced the .net core for Windows and announced the release of the Linux- and OSX-ports for the coming months:
http://blogs.msdn.com/b/dotnet/archive/2015/02/03/coreclr-is-now-open-source.aspx

Today, .NET Core builds and runs on Windows. We will be adding Linux and Mac implementations of platform-specific components over the next few months. We already have some Linux-specific code in .NET Core, but we're really just getting started on our ports. We wanted to open up the code first, so that we could all enjoy the cross-platform journey from the outset.

TL;DR: What parts of .net does the editor need, as soon as these are multiplatform-open source, could it just be compiled?

I guess this is the place to post instead of opening a new thread:
Question 3 of the registration quiz links to a knowledgebase on adventuregamestudio.co.uk, which is a domain apparently for sale and therefore redirecting to http://www.adventuregamestudio.co.uk/?f.
No http://www.adventuregamestudio.co.uk/ackb.shtml to be found there.