thank you kindly, pogmoor!
in g7 there is a create->text option on a menu but i don''t think there is a similar menu option in First. and for some odd reason (tired? unfamiliar?) i was clicking on the note rather than next to it. i like your idea of a line of notes. it might save time to have a scale in the different voices that is prefingered. i might use a left hand number of 5 so that it's clear when i didn't change the copied note.
for the plugins, i tried searching out my drive for the location of existing plugins (C:\ProgramData\Avid\Sibelius 7 First\Resources\en.lproj\Plugins) and adding a folder with the Add Fingering to Notes plugin. I restarted first but the plugin didn't show up. So I then removed one of the plugin folders to test if that really was the correct location. I restarted first and those plugins were not available. So then I tried adding the Add Fingerings plugin to an existing folder, restarted, but it still didn't show up. This led me to believe that first cannot add new plugins (it is SO restricted - sigh
however, then i renamed an existing plugin (AddBrassFingering) in order to save it, then renamed AddFingeringtoNotes.plg to AddBrassFingering.plg and put it where the original brass fingering plugin was. Viola!!! it worked. feeling pretty pleased with myself over that.