I personally would not recommend including the compromise. Not unless your target company is a small scaled SME.. then maybe yes. If your target company is a MNC or SME that is big enough, I don't think they sweat such little stuff.

I will recommend including all your past achievements and experience, and how that will translate to their benefit. For example, if you know a certain project that company is embarking, it will be good to state how you can contribute. The hard part is not to oversell yourself, while keeping the cover letter succinct.