Also gimmicky mods should probably become exilus mods too, because who makes a serious build with a gimmicky mod? There just isn't enough room for those mods in the average build. Those gimmicky mods could make for a lot more diverse playstyles if there was more room for it.
These are mods like Combustion Beam, Flux overdrive, Gun Glide, firestorm, Metal Augur, Napalm Grenades, Motus Setup, Neutralizing Justice, Sharpshooter, Thunderbolt, wild frenzy, acid shells, Nightwatch Napalm, Catalyzer Link, thermagnetic shells, rebound, etc. Some of these may need tweaking if made exilus as to not be overpowered, or just wouldn't be the best fit.
Idea #1 - A mod that blinds nearby (7 meters or so) enemies for 5 seconds upon switching to or from that weapon. Possibly in only about a 90 degree angle in front of the aiming rectilce. This would encourage more people to also use mods that affect holster speed and give a reliable method to do finishers that doesn't involve using inaros, excalibur, ash, or loki.
Idea #2 - A mod that buffs damage for 10 seconds after a headshot by up to 100% but goes up 10% for each headshot.
Idea #3 - A mod that increases the effect of all other mods on the gun by 10%
Idea #4 - A mod that increases crit chance on a specific enemy additively by 1% for each bullet that hits. This would increase only on that single enemy and remain for 10 seconds
Idea #5 - A mod that increases fire rate by 3% for each bullet that lands on an enemy but is reset to 0 only when a bullet misses.
Idea #6 - A mod that has a 50% chance of applying a random status effect
Idea #7 - A mod that has a 7% chance per bullet to make an enemy do the disco for a few seconds