Yes, that's exactly what I do (and Sir_Vet as well from what he's told me) because it means that more people can play them. They appear to not be backwards compatible, so in order for the most people to be able to play them, you need to create it on the earliest version of the game you can.
It's certainly not ideal in some cases, but with the like of SH2 I prefer the 1.3.1 version so it's fine for me.
I wrote here mostly to tell that there's no way to choose 1.3 version, while uploading Stronghold Crusader skirmish map.
For that issue to get solved, you'd have to wait for a moderator to add it in, though it's likely to not happen I'm afraid. Also, there is a very, very small chance of your file actually being posted know because no files are checked any longer AFAIK. Files have been uploaded since, I uploaded one last June (or about then), the only thing is that no-one approves them any more here.
The good news is, that on my own site, I also missed this off - so thanks for letting me know [This message has been edited by Duke Chris (edited 05-04-2014 @ 01:08 PM).]