Roms:
On the Enveloping / non-enveloping question, it depends on what I'm trying to do...
Castling / slow opponent: Envelopers first, non-envelopers second. Maybe stay enveloping all battle to take advantage of the double damage...
Fast opponent: non-envelopers till they're slow enough to kill. Then I'd consider envelopers if I had to force down 2-3 shields to slow them down...
On Rommie Phaser Arcs:
I don't know exactly what phaser arcs they're supposed to shoot through. They can bear many, but not all, of their phasers on a broadside. They don't have the wing phasers that make the Klinks painful on the #2 / #6, they don't have as much dedicated rear-firing on the #3 and #5, many times I'll do either a centerline (all but the dedicated RA-weapons), then a turning shot where the rear-weapons are fired...
On Phaser numbers, I think the KCR (BCH) gets more than 8 phasers, too...
Actually, that's one of the Rommie "racial strengths", ie, they're more of a HW-laden race than a phaser race...