They are 'technically' back in service, but not flown. After years of storing them as the airline could not sell them, last year it was decided to make them airworthy again to re-introduce Biman flights to Barishal (BZL). Unfortunately, there was a crew shortage (I get the feeling that all the ATP pilots were promoted for F28 certification, and no one retained for ATP flights), the plan was given up, and now Biman put out a tender for the trade-in of the three F-28s and two ATPs for three Dash 8s or ATR 42/72. Therefore, I don't think the ATPs are flown at all.
Again, I think this is poor fleet planning on Biman's part. I would think that CRJ or ERJs would be better replacements for F28 and ATP as they would be able to fly to airports like CXB but also allow additional frequencies to RGN and perhaps to cities in India's Northeast. The RJs can work along with the Boeing 737-300s to cover most of Biman's regional / domestic network.
As for F28 being 2-3 and 3-2, I do not know why that is the case. My best guess is that after the plane crash in Sylhet in 1997 (no fatalities, thank god, but w/o of the aircraft) and the subsequent withdrawal of ATP from service lead to an equipment crunch, additional F-28s were brought in quickly (from Indonesia, if I am not mistaken) so they really could not have the time to specify the seating on the a/c.
Gabe, note on an earlier request of yours: Bismillah is offering DAC-CGP-BKK
cargo flights on the L1011 and is also seeking passenger rights from DAC to India. GMG has received CAAB approval for international flights, and plans to fly to CCU, DEL and KTM
according to press reports. When I interviewed the CEO of GMG, he did tell me that he was very interested in flying to the mid-East, and had done preliminary fleet study for that service.