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When talking about RPG creation software, if a game creator is "flexible", you're going have to code a lot to make a halfway decent game. It's pretty much a euphemism.
Typically, "flexible" RPG creators usually come with crappy default systems, encouraging you to code your own. It sounds easy until it turns out the software doesn't even come with any commands to gain access to the software's enemies and items, meaning you'd have to code THEM too. It's almost the same as coding your own game from scratch.
A good example of "flexible" RPG creation software is RPG Toolkit.
Not adhering to a certain set of principles, instead morally adapting to the situation at hand.
"When Mary was wealthy, she was against theft, but now that she's poor, she is a thief. I guess she is morally flexible."
The ability to lift alcoholic drinks to your mouth on a rapid basis.
Randy was pounding Miller Genuine Drafts last night. He had a very flexible elbow