Is it al all possible to re-assign the usual keyboard shortcuts to match those of a Premiere Pro keyboard that I already have? I'd like to be able to use "." rather than "A" to move trimmer-selected shots to the timeline among others...

For the most part, that answer should be yes. Just go to Options - Customize Keyboard... and change the settings to whatever you want them to be. Just be aware that when asking for help, we may give you the instructions that include default keypresses.

Many thanks Edward.