Hey there,

1) where to configure the toolbar?

For EasyBlog, you can configure the toolbar at Backend > EasyBlog > Settings > Layout > Toolbar.

For EasyDiscuss, you can configure the toolbar at Backend > EasyDiscuss > Settings > Layout > Toolbar.

For EasyBlog, you can configure the toolbar at Backend > EasySocial > Settings > Layout > Toolbar.

2) Is there any custom module positions built in?

If I understand your question, do you mean you want to choose other position for the module?

If yes, you can go to Backend > Extensions > Modules > select the module that you want to change its position > look for 'Position'.

Thanks, I mean built-in module position like JomSocial provides explained on this page:
http://documentation.jomsocial.com/wiki/Built-in_Module_Positions

What's more, on the same page they elaborate how to make a custom position like this:

Adding Your Own Module Position
You can add your module position name and insert it anywhere within any JomSocial template files. The Code Snippet that does this for tabbed module layout is:

<div class="joms-module__wrapper"><?php $this->renderModules('PositionName'); ?></div>

Hey there,

Do make sure that you had enabled the 'Preview Module Positions' first which is at Backend > Extensions > Template > Options.

After that, you can apply '?tp=1' on the page's URL that you want to check for the module position example like EasyBlog frontpage. So you can see the built-in module position for EasyBlog frontpage. (Kindly refer the screenshot)