I don't think this exists but hoping some experts out there might know a way to set up an ability that gives you a radio button on the character sheet so that when X action happens you can apply Y effect.

For e.g. an ability that says if you move 1/2 your speed or less in a turn you gain a +2 bonus to CHA. So on your character sheet there'd be the "I moved less than half my speed" button that when clicked would add +2 to your CHA and remove the +2 when clicked off.

I have a more complicated effect in mind that this functionality would make much easier to track but just giving a simple example for the sake of clarity.

Thanks in advance.

The slider bar you mentioned doesn’t exist here. It is likely being generated by a 3rd party browser extension I am guessing you use such as Beyond20. 

Sorry I feel like I haven't been very clear. There's no slider bar being generated anywhere, that's what I'm trying to set up in DDB.

Radio buttons already exist in the DDB character sheet in the form of limited use abilities and spell slots. I'm asking if it's possible to set up an ability in a Homebrew subclass that has a button, like a limited use ability, that will switch on and off changes to the character sheet?

For example, if I have an ability I can use twice per short rest that will give me +2 to AC and +2 to DEX saves, can I set it up so that when I tick off one of my uses it adds the +2 AC and +2 to DEX saves on the sheet in DDB?

Ah. No, temporary effects like that are not currently supported on DDB’s character sheets, but that is on the list.

However, you can fake it by putting those modifiers on magic items instead and then simply equip/unequip them as needed.

Ah. Ok. No worries, thanks for your help.