Scion said:
Hi!
For spell-like abilities, these feats come to my mind:
1.)
Boost Spell-like Ability; Pre: -; Benef: Increase save DC by 2 against your selected spell-like ability; Source: BoVD 47
2.)
Consecrate Spell-like Ability; Pre: Any good alignment; Benef: Adds good descriptor to spell-like ability; Source: BoED 42
3.)
Corrupt Spell-like Ability; Pre: Any evil alignment; Benef: Add the evil descriptor to one spell-like ability; Source: BoVD 48
4.)
Empower Spell-like Ability; Pre: Spell-like ability at caster level 6th; Benef: Increase spell-like ability's variable, numeric effects by 50%; Source: MM 303
5.)
Heighten Spell-like Ability; Pre: Spell-like ability at caster level 6th or higher; Benef: Use spell-like ability at higher level up to 3/day; Source: CA 80
6.)
Maximize Spell-like Ability; Pre:Spell-like ability at caster level 6th or higher; Benef: Maximize spell-like ability's variable numeric effects up to 3/day; Source: CA 81
7.)
Mortalbane; Pre:-; Benef: Make one spell-like ability more deadly to mortals; Source: BoVD 49
8.)
Purify Spell-like Ability; Pre: Any good alignment; Benef: Adds good descriptor to spell-like ability; neutral cr. take 1/2 and good cr. take no damage; Source: BoED 45
9.)
Quicken Spell-like Ability; Pre: Spell-like ability at caster level 10th; Benef: Use one spell-like ability as a free action; Source: MM 304
10.)
Supernatural Transformation; Pre: Innate spell-like ability; Benef: One of your innate spell-like abilities becomes a supernatural ability; Source: SS 39
11.)
Violate Spell-like Ability; Pre: Knowledge (religion) 6 ranks; Benef: Add evil descriptor to one spell-like ability; 1/2 damage is vile damage; SOurce: BoVD 50
12.)
Arcane Mastery; Pre: Ability to cast arcane spells, use invocations, or use spell-like abilities; Benef: Take 10 on caster level checks; Source: CA 73
13.)
Extend Spell-like Ability: Source: SHOULD HAVE BEEN presented in SS, but entry is missing!
BoVD = Book of Vile Darkness
BoED = Book of Exalted Deeds
MM = Monster Manual
CA = Complete Arcane
CD = Complete Divine
SS = Savage Species
And to your question:

I don't think there's any feat that resembles the Practiced Spellcaster feat from CD/CA. You easily could make it up, then...
Kind regards