It would be ok to incorporate veusz into sage?

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You have three choices in how you can include Veusz in Sage: as a standard package, as an optional spkg, or as a contributed (formerly known as experimental) spkg. A contributed spkg doesn't need to be run through the rigorous testing and quality assurance that optional and standard spkg's go through. You assume all responsibility with respect to a contributed spkg: for testing that spkg, how well it integrates with Sage, etc. The Sage project takes no active role in maintaining a contributed spkg. It is up to you to maintain it.

An optional spkg needs to pass a number of hurdles before it can be accepted. But the greatest hurdles of all rest with standard spkg's. The Sage project hosts these three types of packages.