Option for heli only to come on attackSuggestion
Could u do the opposite? 
Heli will come and attack only to the enemy and will fly next to caller's base. 

Hi,

Sorry it's not clear for me. Do want me to implement some kind of "Air Strike/Support" plugin? Where you can use command to call heli that will attack your target?

This should be a separate plugin.

wau good idea. It would be great if you could call your own heli what would protect you
In response to ():
Hi,Sorry it's not clear for me. Do want me to implement some kind of "Air Strike/Support" plugin? W...
Yes. Air Strike Support plugin. 
You can drop bombs with Air Plane
Attack with Helicopter and Tank :D (if tank is possible)
In response to glasiore ():
Yes. Air Strike Support plugin. 
You can drop bombs with Air Plane
Attack with Helicopter...
Heh) I see, but I think it should be separate plugin for this purposes. I'd better not to put all that functions in a single plugin. It will take time to implement, but idea is interest, and I'll consider it.