Is there a plugin which will give a x100/x0.01 scale button on the toolbar

[DanRathbun]

@jim4366

And could it be done in such a way as to be called with shortcut keys?

Yes.

[Jim4366_ModelBalloon.rb | attachment] (removed)

UPDATED: per conversation below

JonWeaver_ModelScaler_v1.0.1.rbz (2.4 KB)

Depending upon what menu you place it under (ie, if you edit the file) will determine where you look in the command list when assigning your keychord shortcuts. (I put the submenu under the “Edit” menu.)