Just because you can do something doesn't mean it's a good idea. In Civilization you can build cities almost anywhere you want, but there's still plenty of dumb ways to go about building cities. In Age of Empires you could build your houses in neat little rows a divide your workers up into men and women for different jobs, but if you spent the time doing that and expected to do well on harder difficulties you'd be pretty dumb.
No, but you did give yourself a 3-4 month headstart in funding, then turn around and complain that things go too quickly.
Why would a bitterly divided world give a new and largely unproven organization all their best resources? And what happens after the alien threat is defeated? What if one of the major powers coopts Xenonauts and uses their troops and equipment to attack other nations? Or what if I'm Germany and sent all my best troops and money and equipment to Xenonauts, only to get swallowed up by the USSR. Tell me it wouldn't happen, and I'll tell you that you don't know world history.
Eh, I never supported your post or attacked it. I just pointed out how things are. You're trying to use more resources than the game makes available. And then you're also playing on a relatively easy difficulty and probably hiring a lot more scientists than you'd be able to afford without $10 million floating around. I'd guess most players are stuck with 15-30 for most of the game because they can't afford more--that makes a huge difference in how fast tech trees go by.
You're not limited, but it's also not optimal. It has nothing to do with my opinion or anyone else's, it's just simple math--extra ground teams take a very long time to pay for themselves (if ever). Of course, you already modded the game once to give yourself far more resources, so I'm not sure why you're complaining--either increase the number of UFOs that come or increase the resources you get from them. You can absolutely play the game however you want, but don't be shocked when the game punishes you for playing in a way it was never designed to support.
The bottom line is that if you want to play the game the way you're describing, you're going to have to mod the game--increase research/manufacturing times because you've given yourself the money to speed those processes up (shortening the game) and increase the number of UFOs/resources you get per wave, or if possible the wave frequency.