Update 2.5:
-FINALLY i got an .ini configuration file working! Thanks to Julio, he helped me a lot, a great guy who created a lot of GTA IV mods (like the Iron Man, Spider Man, etc). Here is his facebook page https://www.facebook.com/GtaIVScripting.

Update 2.0.2:
-You don't need to buy or get a parachute anymore, the mod itself gives you one when enabled.
-No configuration file yet, i just can't do it. I need some help here to read the .ini file (in c++).
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How to install:
Install Script Hook by Alexander Blade then drag the "Nice Fly.asi" and "nicefly_config.ini" files to the main GTA V directory.

Controls:
-Press H - to enable/disable.
-Hold LSHIFT to boost.

How to Fly:
-Jump high and hold S to gain altitute.
(W goes down as always)

Known Issues:
-A parachute is needed to fly.

Please report any issues in the comments.
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FunkyBlackCat lindo