Yeah well, it's their task to check stuff in other distributions too. We also do patch things, fix stuff, change directories and so on, because the goal is to provide a decently integrated operating system. Of course, I agree that it is much better if upstream fixes it on their side, but if they don't, I still think it is on our side to provide the best software we can, and not just to restrict ourselves to deliver upstream code as it is.
I know developers who won't add a patch to a package until upstream has commited it to their code, and some others prefer to still do things even if upstream won't accept them. I have never really seen an overall consensus about this in the project, apart from cooperating with upstream when possible, so in the end each maintainer or each subproject in Debian does it differently.
I, for one, prefer to deliver the best possible code I can.
Of course, some intermediate point such as addind that deb- or debian- prefix to the .pc files in the packages maintained by the Games Team might do, if there is no other way.
In any case, I think my point is already clear, so I won't keep explaining it all and all over again anymore :)
Greetings,
Miry