So many things I have suggested to make all these things easy, but it could take PG ages to get around to them.
With audio clip import if you set the Audio Edit to snap it will import the audio clip to the drag position, 1/4 1/8 1/16 has been asked for snap options.
With midi snap import hasn't been implemented yet, if you drag n drop a midi clip into Biab you need to select Merge (this needs to be default) otherwise the whole track is wiped out, and down the bottom of the import dialog there is insert so many bars before the item so you need to enter that, it should also import to the piano roll track you drag it into not some other track.
You can copy and paste audio sections from another instance of Biab.
It has been suggested to be able to drop acidize loops directly into the track with an option to loop for so many bars.

You would be better suggesting development ideas for the BBPlugin then you can do it all in a DAW. Some users die of old age waiting for features in Biab.