Jewel, you can almost certainly have re-gen while using the brakes, the dealer should easily be able to set it up using a magnet on off switch set up on the brake lever... So, whenever you pull the brake lever the first bit of braking is done by the re-gen, then if you need more stopping power you just pull the lever more and the braking will increase by the brake, on top of the re-gen braking... It's separate from the pedaling re-gen where you can pick how much effort you can put into the pedals to use it if you want to...
EDIT; Oh, If you don't use the bike for more than a month or two, you MUST make sure the battery hasn't depleted itself and re-charge the battery a MINIMUM of every 3 months to avoid battery problems, as the system will use up some power even when off, to self check... The manual doesn't cover the downsides of battery "neglect" say after 6 months of it sitting not used and not charged up every 3 months it dies and refuses to take a normal charge, needing some professional assistance to revive it...
