I have and lawyers are people too, it really depends on the sensitivity of the intellectual property you might discover, what you want to do with it and how you'd approach any changes w/in the scope of their vision. Some of the Frostbite code is revolutionary -how water dynamics is managed is clearly one of them -They might want a review and the rights to use your mod or parts of it to advertise frostbite. If you remember early testing mass effect and DA examples were pulled from their site, so they will be cautious.
On the other hand, mod developers could help FIX the array of RPG problems and the challenge here is getting Bioware on board to take the help. A written proposal might carry weight: Program management outline and the QA to validate at a minimum, but the risk of rejection is high. However, timing might help for some proactive proposal among the bad press. Again, Bioware will probably want all intellectual property and there is a myriad array of developer approvals needed for the tools I know of.
Take care all