Add options for different loadout types than the default of two gadgets, one primary, one sidearm, a single grenade and a perk. This works well enough, but hinders some playstyles a lot, and I feel if a way to change your loadout format was implemented some more creative strategies could be used.

Grenadier for example, is an absolutely garbage perk as is. You can throw farther for your one single grenade. That's it. Once you throw the grenade your perk is practically useless. Demolisher is by far the better pick, as you get a second grenade to utilize.

If it were changed so that Demolisher wasn't a perk, but instead a loadout format that replaces your pistol with an extra grenade or two, it would simultaneously add new playstyle options while also buffing Grenadier because there isn't a competing perk that's objectively better, and there is a loadout style that is heavily benefited by the perk.

Some other ideas for loadout styles I had:
Akimbos [ALL CLASS] - Replaces your primary with a second pistol slot letting you duel wield, as well as a second perk, sacrificing your self defense for more utility
Spray N' Pray [ASSAULT] - No gadgets, two primaries. For when you want to hold the trigger without reloading.
Vehicles Specialist [ENGINEER] - No more rocket launcher, but you get a second repair tool slot, allowing you to double your repair rate, or bring a drone as well as your repair tool
Passive Aggression [MEDIC] - No guns, but you get to bring all of your gadgets and a second perk. Have fun chasing enemies with your defibrillator!
Rapid Deployment [RECON] - Gets rid of your grenade and pistol for a second zipline launcher, allowing you to reposition yourself quickly, but if you get caught out by someone rushing you, you have low defensive capabilities