Well, it's a great concept and I'd like to see it in action, but there are a few problems.
First of all, you may want to consider the expansion packs for MC Heli, since the expansion system for MC Heli is unique in the way of actually modifying mod folders.
Second, I have found that if a client has a different config setting for the amount of damage a vehicle deals than a server, MC Heli uses the client's config. This means that if a Hind configuration file on a server had a default damage output of 500 (not accurate) and the client configuration had a setting of 189000, the Hind from that client would deal that much damage. The mod creator has not addressed this though, and hasn't been active since last year.
Otherwise, I'm all for it! To fix the issues above, the best solution would probably be a modpack launcher that downloads the expansion packs and configuration files every time the client launches.