Add custom gear weapons, armor, miscellaneous, etc… for example my gm gave me a pistol that does 2d4 base damage, custom attack is incapable of covering  a +1 of this custom weapon, however 2d4 damage does not exist on any weapon in the game, so reskinning is not possible

You can create homebrew weapons and items, the coding is just less user friendly.

You can create a weapon through the homebrew section, select pistol as a base, then add a modifer to it - the modifer would be the damage.

Then you'd need to go back to your character sheet to add it. The homebrewing section is in the Collections group at the top.

I can agree that it would be nice to be able to properly customise items on the character sheets by themselves though.

Maybe I am doing something wrong, all that did was add an extra 2d4 damage to a 1d10 weapon. There is an option to replace damage type, but not replace the damage itself