as to your first point....
don't think you've thought this through.... let's say you're looking for advantage on a fight, you're hidden right click on the enemy, how does it do the attack you want. How do you attack objects out of combat and have the choice of which weapon? Are you always going to be walking up to a firebarrel and breaking it melee, or are you always going to beat down a door with ranged... That's why these buttons are here, so you have a choice without making the game decide the wrong option you can't get around.
Help button.... you can help a downed friend like spelt for a whole action, or shove them to same effect for bonus action. if you have illithid powers and have the restoration effect you might want to do that reduce to 0 option.
Special attacks, these follow special rules and putting the decision on whether it's a melee or ranged attack on the system again creates issues, as game code writing for situations you get in to is severely limited.
Think more, speak less.
Read more, my friend. There would still be a button for Attack and a toggle to switch between Melee and Ranged. So, you have Ranged toggled, so you have your crossbow out. You hover over the enemy you want to shoot. The bow icon appears. You click and fire. Hit the toggle again to switch to Melee. Hover over enemy. Sword icon appears. Click and attack.
Want to do a special maneuver? Click on the Attack button. Melee is what you have out, so only the melee buttons for special attacks appear like Menacing Attack or Lacerate in a popup window similar to the Throw popup window.
So, want to shoot a barrel? Click on the toggle to switch to Ranged, if you aren't already toggled to Ranged. Highlight the barrel. Click and it shoots. If the barrel doesn't turn into the Bow icon, right click and choose attack; you know, like you can do that currently right now in the game.
Help button is specifically used for stabilizing downed friends so they don't die. You don't need a button for that. If they are down, hover over them and a heart appears. Click on them and you'll run up to them and stabilize them. I'm suggesting a Medicine check be used because, you know, that's the D&D 5e rules and it's there for a reason to give the Medicine skill a very important role in the game. I'm not even sure what else you said there. It's kinda confusing What does all that have to do with the Help button and removing it?
Special attacks. Why would creating a single button for each special attack be an issue code-wise? You click on Menacing Attack, it applies extra damage and condition to whatever attack you use. Here's a basic code that could work: =if(("Menacing Attack")*and("Melee"),(Melee Damage + randbetween(1,8))*and(Frightened Condition),(Ranged Damage + randbetween(1,8))*and(Frightened Condition) There. Code solved. Fixed. One button clicked, depending on what you have toggled, it applies it to that weapon's damage and initiates the savings through against Fear.
