A pure CSS solution:
/* align images in topic/replies center */
div.bbp-reply-content img {
display: block;
margin-left: auto;
margin-right: auto;
}
This may end up being added as a Style Pack option in the near future. It’s simple enough, and I can see many people wanting this besides just you ??
NOTE: This will align ANY image added to topic/reply, not just specifically imgur. If you wanted ONLY imgur as this topic mentions, then a pure CSS solution won’t work, and it’ll take some custom code to check the source URL of the image, and then only apply the above CSS to specific source URLs.
Let me know if this works for you and I’ll make as resolved (or you can).