Zipties, for binding people's hands much like maglock handcuffs, but can be broken by people with sufficient strength. Also degrades over multiple checks, making them easier to break with every failure.
Any other ideas can be posted below. I think that making kidnapping easier would be one big way to decrease the amount of "no RP step out of the shadows" vattings going on. A lot of the time, in my experience, people may prefer to kidnap someone but do not want to deal with the absolute logistical nightmare that it poses without these sorts of tools, so they'd rather just kill people.