Here's what I'd like:

Rebels

1) a large based gunship or shuttle (maybe both!) that isn't a modified freighter (X4, RM-09, shared Lambda, etc)

2) additional ship with Systems upgrade slot (maybe combine with 1?)

Imperials

1) a large based Imperial Customs ship to fit between the Lambda and Decimator (PB-950, Guardian, Imperial Customs Frigate, etc)

2) at least 1 ship Turret upgrade slot

3) Fix to make Defender more appealing

4) Fix to ordance to make Bomber and Punisher more appealing

Scum

1) a scum ship with primary weapon Firepower: 4

2) Pilot abilities: pilots with attack bonuses or direct damage (every ship should have at least 1 unique pilot)

Pilots who debuff the enemy (need more - should be a strong scum focus)

Pilots with a self-defensive ability (need some - an ace with an elite would be nice)

Pilots with situational abilities eg vs obstacles, collisions, etc (would be ok)

No more pilots who buff other ship's defenses directly (eg. Serissu - but debuffing an enemy's attack would be ok)

3) Fix to make non-heavy Scyk more appealing (title would be fine)

4) additional ship with Systems upgrade slot (small would be nice)

5) additional small ship with Salvaged Astromech upgrade slot

6) more Scum specific upgrades (eg. Crew: Live Bounty, Cannon: Disintegrator Cannon, etc).