the only rule of thumb to follow in regards to install order is to install free tools last.
the order i like to follow is:
eCart
Design Extender
Data Bridge
Free tools
but is not essential to use that order as long as free tools is not last.
If you had other extensions installed and uninstalled them before installing free tools, you may need to reset the workspace layout. Go to Windows -> Workspace Layout -> Reset '<your layout name>'
you may also need to disable Memento, go to WebAssist -> Preferences and set memento to show Never.
and also Delete the Dreamweaver Cache file from the users configuration folder:
common_installation_issues.php
If you continue to get errors, please let us know what they are and we will look into them.
as for new features to data bridge, we have not finalized any plans at this time, we are working on other projects. That is not to say that no new features will be added, just that it is not currently on the road map. Common requests are to add Data Grids and more up to date designs using HTML 5 and CSS3. These ideas are being evaluated, but i cannot comment on the likelihood or a time line.