Sadly no.
Or at least not easily. There isn't a bonus for recharge rate in the ModifierType API.
It could proabably be done by creating a bunch of copies of the roboport entity, item and recipee definitions with chaged recharge rates, and then upon researchen the technology, switching between them automatically, but that's more work than I have time for, given that I'm not too familiar with Factorio Modding.
