I'm pretty new to xpenology but it seems like it should work just like the original with two major exceptions:
1) no regular / stable updates. Once you have installed the version, you're stuck with it for a while until a stable xpenology update comes out, which seems like a long while after the official update was released.
2) certain tools don't work due to license. The only one that I am aware of are Quick Connect because it goes through Synology's servers. If there are other tools that also goes through synology's server then they would also violate some licensing terms.
As for cameras, I believe there should be no problems with adding camera licenses to xpenology.