"WeaponStuff allows you to change many properties of weapons, including, but
not limited to FireRates, Damage, Momentum, Projectile Speed, and
Projectile Lifetime. There is also the ability to allow the weapon to use the
# firemode of a different weapon, letting you shoot shock balls from your
rocket launcher, say. You can also swap out weapons for other weapons on a
map, replacing a bio rifle with a redeemer, for example. You can also change
ammo amounts, for the weapon and it's ammo boxes. As well as this you can
also specify how many projectiles a gun should shoot out at once..."

WeaponStuff needs an INT file.  I discovered that you can make an INT file for any weapon from information found in the UCL file.  For example,

[Public]
Object=(Class=Class,MetaClass=Engine.Mutator,Name=SentinelsRcBeta3.mutSentinels,Description="")
Object=(Class=Class,MetaClass=Engine.Weapon,Name=SentinelsRcBeta3.SentinelDeployer,Description="")
Object=(Class=Class,MetaClass=Engine.Weapon,Name=SentinelsRcBeta3.baSentinelDeployer,Description="")

With this, you can replace any weapon with the sentinel deployer.  You can also decrease the firing rate.  In particular, a faster secondary will heal a sentinel faster.  What you apparently can't do is make adjustments to a sentinel, or, at least, I don't know how.