Yes it will bypass RealBand if you have your own DAW you to prefer to work in thus cutting out the stress.
You can do all you described in the BBPlugin.
You can load as many BBPlugins in your DAW as you like,
each can have it's own style, and you can have a lot more than 48 tracks.
You can even have a BBPlugin for each song section by clicking the little arrow under the Sync button and set it to the bar you want it to start sync play on, you would also remove the Lead-In or Ending or both depending on the song section. This will also give you more than 255 bars.
There is an issue with the current version that is cutting part of the last beat off when Ending is un-checked, but that should be fixed in the next release hopefully.