Pending Allow separate custom license fields by Product category

[CrazyHackGUT]

For example, I'm develop XenForo add-ons and SourceMod plugins.
For XenForo add-ons, I need force user fill:

• Board URL
• Board Title

Before they can download license.

For SourceMod, I need force user fill:

• Server IP address
• Server port

In currently implementation of custom license fields, I can't do this, because custom license fields is common for every license. I can't enable custom field for Products placed only in categories X, Y and Z.