Better Image Browsing

I think it'd be cool if there were two or three additional functions for browsing older messages and images.

• Being able to set "bookmarks" for individual channels. I imagine it as being able to mark certain messages and then later jump back to those specific messages, so you can pick up stalking the channel where you left off
• Being able to jump to the start of the channel
• Having a "Image-Only" mode, where only messages with images will be shown. Maybe in some kind of overlay with fullscreen options and such. For better research.