Hi GrouchyAdmin
You can not add additional processors to the Standard. There are several to choose from already, it has it all, credit card processors, check processors, phone billing processors and alternative billing. So it is more then enough processors to choose from already.
How ever, the Pro you can add processors too. But the pro version must soon have every possible payment platform there is already integrated

But if you find one that is not, then we will look at that processors API and give you a price based on this.
Not sure I understand the questions about customizations that cant easily be templated? But in the standard version you can not get any customizations done. You can of course have your own signup and webmaster templates and change the way this look. But you cant have other customizations done.
But again, the mpa3 ( Standard, Pro and Enterprise ) are huge programs with A LOT of features in them already, so you will need a pretty good imagination to come up with something that is already not there

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