We had a BA Pulse Laser in the alpha prior to the first beta release and it never felt right or different enough from the regular Beam Laser to warrant inclusion. We tweaked around with refire rates, ranges, pulse counts, etc. and it never was unique enough. This likely because BA don't track heat like the vehicular assets do. Short of a major change to allow that there is no point to adding a weapon that would be considered fluff.
We have big plans for BA going forward, you aren't missing anything by not having the BA micro pulse - trust me.