StartofLine and EndofLine to become assignable functions

As I’m new here, and this is my first feature request, I should firstly say what a brilliant piece of software Scrivener is, I’m loving it.

My request is for the functions to send the cursor to the start of the line, or the end of the line, become assignable key commands. (In Word these functions are called ‘StartofLine’ and ‘EndofLine’).

At the moment, on Windows, these seems to be Windows-level functions that are controlled by the Home and End keys. (I don’t know what the situation is with them on Macs these days). But these keys are not easy to access quickly, and I’ve spent many years using Alt-Left Arrow and Alt-Right Arrow for these functions, and I’d like to be able to use them again for this.

No worries if this is not possible, or feasible, and it may just be me, but I am missing those functions/key-commands.