There's a preset 30min button & I can see that you already know about pressing/ clicking on the 'Custom' button to set 30|10 or any time control you like.
If there is currently nobody else seeking that time control you can send the challenge to a like minded friend/ opponent, I think it helps if you're both in Live at the same time, & yes it would be good to have a preset 30|10 button
If you want to play with an increment it goes from 15/10 (that's really too fast for me to play a good game) to 45/45. That's a HUGE gap. I know, I know, I know, I can set a custom time control. I used to routinely get great games at 30/10 for many years, but now I just can't even get a game around that time control. Two possible solutions:
1. Create another default setting between those two times from the drop down selections.
2. Make the custom seek graph always visible when you first go to Live Chess. Right now it's there, but it's hidden.
I feel pretty strong about this. I've been a member here for a long time and I'm just not having fun at 15/10 or 45/45.