Would it be possible to give me the option to modify the amount of military I make available to my allies?
Say 1-25% (Max)

Could I also have the option for specifying which type of military to send, offering only troops, or tanks?

That would all have to be coded, there are currently way more important things to get to, so I doubt it'll be done any time soon

Yes it would be possible.

not sending tanks to offensive allys would be the popular one if you want to repost it on bugs and suggestions

Yeah %'s might be a bit tough to code but military types would be easier..