If you want to add a search engine list, it could be impossible. Avant Browser gets paid by the default search engine for the queries searched by the users in the browser. More other search engines added, less income produced. Avant Browser is not as big as firefox and Chrome having, the source of income is limited. Wish you understand:).
If you want to set another engine as the default search engine, go to Tools->Avant Browser Options...->Search Engine->Standard Search and add the search engine desired.
Please provide the following information before reporting problems:Avant Version; System(also point out it is a 32 or 64-bit OS);IE; Memory Size; CPU Speed;
Optional: Firewall; Graphics CardFor the problems hard to replay, could you add me into your MSN or Skype list if you use either of them? The advantage is that you can let us know the situation in the first place by making some screenshots, sharing your screen or explaining the specific problems more clearly when they happen
.E-mail: Jasmine#avantbrowser.com(please repalce # with @)