Extend/remove limit on variants drop down?

When making variants from a template, there appears to be a limit of 20 items in the drop-down menu of variants. Is it possible to remove this limit altogether, or at least extend it considerably?

At the moment, when creating variants beyond to 20 limit, I have to remember the variant name and type it in.

Sorry, just realised that if I type a part key, then I can find my variant in the list!