To be perfectly honest about all of this, I can't help feel like you're shooting yourself in the leg when you're trying to adjust the future main promoter of your engine to a mere domain-name. Keep in mind, that the name you end up with now, is going to be the name that people will know you by, the name that will be spread around in forums, blogs and other websites, and stick to people's memories due to it repetetively popping up, and being easy to remember. What do you really associate with the name
FIFE? Personally, I find it to be a rather weak acronym, seeing as it doesn't really become an actual word on its own.
OGRE, the 3D engine is an excellent example of a good acronym. They cheated a little in order to fit 'Object-Oriented Graphics Rendering Engine' into 'OGRE', but in return, they have a very well known name, already associated with a lot of other things, probably most importantly the recently famed LotR series and games. As soon as someone tells you that Ogre is actually not just the name of a popular fantasy-creature, but also an excellent graphics engines, well then, you'll remember that everytime you hear the word from now on won't you? In addition to that, they got themselves a mighty good mascot as well! What does
FIFE really give you?
Also, the word
isometric keeps popping up. I didn't really know the exactly meaning of this word, so I
looked it up, and the results weren't really as I expected, seeing as this is a 2D engine
only, correct?
What is simply quite special about your engine, is that it is meant for 2D games, and does this exceedingly well compared to the other weak alternatives out there. You should play on this, making it clear that you're not here to fight the 3D giants, but to offer an alternative to the poorly developed 2D engines out there.
Flexible has a positive ring to it, yet it can be found in the description of pretty much any application these days, making it almost a basic feature rather than a bonus.
I think you would be better off playing with words like '2D', 'Birdview', and 'top-down', maybe some predator birds, like Hawk, Eagle and Falkon. I'll start bainstorming some proper names now...
In case you're still wondering: I'm pro name&domain-change.