I use a TMax scooter all day long on the job in San Francisco which has a few hills.
I'd say about 95% of the time, backing against a curb does the job.
For the those rare situations, it does have a parking brake cable that goes to the rear brake.
It's lever, below the left grip, is easy to deploy, disengage and has a positive feeling. The design is great in that when on, the lever is just under the fingers, so when I get on the bike, I can always feel it's engaged because my fingers won't wrap all the way around the grip, but can just push toward me, releasing the brake.
So would I miss this mechanical marvel on my Empulse? Nah, just use the above-mentioned velcro.