This is really a suggestion for the design team.
There seems to be a small but consistent stream of people having problems which can be traced to power (low voltage) issues.
The R-PI is very susceptible to low voltage issues, and by low voltage, we are talking of small fractions of a volt below 5.0v. With a nominally 5v PSU, that small voltage change can easily occur in the power cable when we are talking about several amps (2 to 2.5).
It appears that the standard PSU as delivered is fine.
Where problems mostly seem to occur is in installations where it is not possible to use the standard PSU directly because there is no nearby power. In this case, the usual tactic is to extend the low power cable. The resulting increased voltage drop causes issues.
A better solution may be to design add an optional form of PSU - a buck-converter placed as close as possible to the R-Shake, and supplied with 12v to 15v.
The longer 12v cable will still be subject to voltage drop, but 0.2v drop on 12v is not the same as 0.2v drop on a 5.0v supply, and will be compensated by the converter.
These buck converters are cheap - the housing and connectors likely being the major cost.
People with electronic skills, or access to someone with them, can create these pretty easily for themselves, but for most people a “plug and play” off the shelf, tested system is going to be preferable.