Absolutely! As shown with a few examples within this demo, you can use all the bootstrap goodies such as carousels, modal windows, tooltips, tabs, accordions, form elements...
Hell yeah! This template is built on the awesome Flat UI Pro kit by Designmodo.
All the icons & goodies you can see on the kit presentation can be used in Booom!
Those gorgeous illustrations are available in SVG format (vector), which means they're completely scaleable without any quality loss.
Nooooo. Yeww, no way! The Bootsrap files are totally untouched - all the customizations are done on extra css (or LESS) files, so you can upgrade bootstrap versions wihout any modification losses.