- w moves you to the beginning of the next word
- e moves you to the last letter of the word
- i lets you start editing right where the cursor is
- a lets you start editing one character ahead
In your situation, it seems like you want a consistent way to append to a word, even if you’re on the last letter. I’d switch to using wi instead of ea
I advise against remapping the basic vim movement controls, they are the way they are for a reason.