It seems you're working on the live site, which is a little confusing since every so often there will be a big change and I won't know why. In future perhaps you could make a copy in a separate folder for forum users. In any case, I have my own offline copy to play with now.
Moving on, I can add the padding you want, but the scrolling bug I don't have a solution to. There is another strange occurance in chrome where when the second link gets closed, it leaves a bigger gap than it started with, but this goes away if you make the text in the <h2> just a bit shorter, deleting 4 letters was enough to fix it.
I changed a reasonable amount of styles for the padding, and I can explain what I did and why if you like, but here's just a quick summary.
I deleted the chirp div and removed the styles for it from imip-style.css, then made several alterations to the st-accordian stuff, I've attached style.css as a txt file. Rename it, drop it in and it should have the padding required.