Tipping busters

I mostly give a x amount of ingame money to people successfully busting me out of jail, just a way to thank them.

I don't know if this is something we all do from time to time, or it is just me.

Anyway, my suggestion would be to add a small option behind the message in your event screen saying something like:
Mr. X successfully busted you out of jail - tip [$........] to thank Mr. X.

When receiving an event with someone busting you out of jail, you quickly can put in a (volunteerly) amount of $ to reward/thank the person.

If you were to do that, put it for revives too. Honestly, it's not a terrible idea, but I don't really see the point, when you could literally click/hold their name to send it to them via their mini profile.

No. They want money they can ask for it up front.

I like this idea, especially if you can pre-define the amount you wish to use for tipping + a custom text message in your personal settings.

So if I set my amount to 50k and custom text to "Thanks mate!", every time I click on the text-button next to the event log it'll send the money with that text message.

I often forget to thank and/or tip for busting/reviving so this'd be a great quality of life improvement

^ this

And indeed this can count for revives too