Currently the limit is 1000 entries, as this is the max that can be put loaded into the regular server cache at a time (from what I understand with my conversations with Vlad).
There's demand for more room, though I'm unsure of the amount in percentage terms. I personally would be interested in this feature.
The cost of using servers with larger cache sizes, to store the expanded list in-cache, might be more costly, though how much so I'm unsure of.
So I'm proposing to add this feature, possibly as part of a higher priced 'pro' offering if the economics don't work for offering it at the current pricing. This could be implemented by itself or with other neat 'pro' features.