Giddy'up, Pardner

I thought I might throw some Engie unlockables at you.

EMP Shottie (Primary Slot)

Shoots an electromagnetic pulse at the enemy, disrupting Spies' cloaks, and "painting" any disguised enemy Spies (without necessarily removing their disguise, but rendering it pretty useless). However, the heavy modifications unto this weapon reduced it's firerate, and it's larger shell size means less per clip.
+ Disrupts enemy cloak

+ Paints enemy Spies

- Reduced clipsize (4 instead of 6)
- Reduced damage? (90%?)

- Slower firerate

Anti-Sap-o-Matic (Drill) (Secondary Slot)
A power tool which allows the user to remove sappers at a faster rate than the Wrench can supply. However, it's not very good for anything else. (Uses ammo?)
+ Removes sappers lickety-split (Faster than 3 hits of the wrench, but not too fast.)
- No pistol means less firepower going forward

'Ol Bessie (Primary Slot)
A trusty dual-barreled shotgun sure to leave a mark. This firearm is good for those who want to get some damage in at farther ranges. Perfect for any outdoor excursion!
+ More range (less spread and falloff)
+ Increased firerate
+ Damage? (120%?)
- Clipsize of only 2 shells
- Slower reload


I chose 2 Primary slot unlockables because the Wrench and Build+Demolish Panels are good as they are, and Valve already decided "3 weapons, any slots". Also, I can't think of another pistol replacement. Maybe a revolver would fit with Engie's character, I dunno. I think 'Ol Bessie's a better match.