Just to preface this, I'm Iron 1, I am not pretending to be good at the game or something with this post.
I absolutely love this game so far, and no matter how bad I am at it, it is still such a fun and enjoyable experience that I just want to keep playing. However, I have one issue with the game that seems to get me killed very often: having to actively look down at my keyboard and make sure I'm pressing the right key for my abilities.
I don't believe many people will have much of an issue with this, but I have pretty big hands that can very easily press the incorrect key if I'm in a rush. Because of this, I decided to remap my C ability to one of my mouse's thumb buttons so that when I play Jett (the first character I decided to learn just because she's not all that complicated) I can quickly throw down smokes, and my X (Ult) mapped to the second thumb button for quick, on the fly activation. This works fine, and generally E is easy enough to activate and I use her Q scarcely enough that those mappings work as-is.
The problem comes in when I switch to a character such as, say, Omen, whose teleports are by default bound to C and X, as they are only used in more niche scenarios. I would much rather be able to quickly smoke or blind an area in a pinch, but I cannot adjust my control scheme to suit this need or else it will screw up my Jett games. In order to fix this, I believe that one of two options are viable: either add separate mappings for each character, or (probably the less complicated option) allow for the player to change which abilities are read as Ability 1, Ability 2, Ability 3, and Ultimate (preferably changed to "Ability 4" to accommodate the change).
This may not seem like a very important issue, but there are too many times for me to count where I got peeked while looking down to make sure I'm activating the correct ability key. It makes no sense that if I'm playing Jett, Omen, or Cypher, my key for their very similar use-case smoke-screen-like abilities have different keybinds depending on the character.