Q:

Prolonged sounds in place of an を

I have noticed them in speech in several expressions:

ざまあみろ
手エ、出して
気イ抜くなよ

They are clearly an informal (if i have got it right) variant of を. But how common is this phenomenon?  What restrictions apply to the preceding noun, if any?  And does this occur with は，が… as well? 

A:

It's not a variant of を. It's an elongated 手/気/etc, and を is still omitted.  This type of elongation very commonly happens with a single-mora word before omitted を (both in fiction and real conversations), but it can happen also before omitted が, は, etc. 

ざまぁないな。 ( ざまはないな。) 
手ぇ出ちまったんだ。 ( 手が出てしまったんだ。) 
気ぃ抜けてんじゃない？ ( 気が抜けてるんじゃない？) 
国ぃ帰ったら… (国へ帰ったら…)

See:

手えふった - what is the "え” here? 
What do the 「ああなる」and「気いします」mean?