Hi Eli,
Sorry for the delay in answering, I was in the hospital for the last week and a half. We allow .exe files under certain circumstances. The main one being if it isn't an 'addon' as such, but instead it's a tool. Just upload it to
LotRO Tools & Utilities for Users or
LotRO Tools & Utilities for Developers, whichever is appropriate and we will check it out. If we have any concerns about it after that, we'll get back to you. Again, sorry for the delay in answering.