@freeeeman: Hi. Bookmark All Tabs will by default save open tabs into any existing folder with the name provided on the options page (this is explained in the caption for the value which displays on the options page, the video and the documentation on this page and also here: sicutunum.com/extensions/bookmark-all-tabs). If a bookmarks folder with that name can not be found, only then will Bookmark All Tabs create a new folder onto the bookmarks bar (unless you uncheck the option to "Add tabs to existing bookmarks folder" on the options page).
To your first question, no there is not a (built-in) option to rename the folder after creating it (like a popup or something). That would defeat the purpose of this extension. You can right click the folder after bookmarking if you need to rename it something other than the default value you already chose on the options page.
In the latest version (2.3) there are also options to automatically save (into any nested folder you chose using the default name value) using the current day, date, time, include the active page as part of the folder name etc). Unfortunately Opera is very bad about passing updates through. It can sometimes take months after submitting to them, or never at all and they don't provide any explanations about this.
You can use Chrome extensions via Opera (just search for "Install Chrome Extensions" in the Opera store if you don't already have it). I would recommend installing that extension then just using the Chrome version of Bookmark All Tabs and all other extensions. Also, do visit the link above where the most up to date documentation can be found on all the cool stuff that can be found in the latest version.
Very useful extension, but i would like much more if the controls (volume and music time) were sliding controls, besides just clicking. Another cool feature that would be cool could be the possibilitie of searching for more musics! Anyways, keep up the good work