I've been lax on fulfilling my intention to detail the homebrew stuff for warlock, My apologies for that, caused by Holiday + increased workload after Holiday.
I've just had my first session Playing my new Warlock: Tarneuril Leafsong
who seems to be an Elf (but is actually a changeling) and it was quite fun (I ditched my idea for a shadowgnome warlock). I have talked my GM into allowing a Homebrew Feat chain for Warlocks: Floating Invocation (Least), (Lesser), (Greater), (Dark).
Floating Invocation Feat Chain