Your best chance, if I am understanding you correctly, is to check out the mods forums and find out what best suits your preferences. There are quite a few mods that have custom scenario's with TSL's ( True Start Locations) incorporated into them. ROM AND 2, HRW, R2R, and several others.
Since I don't know what your system specs are, I'm going to guess that your PC is limited to certain mods that don't depend on higher end content. If you could be a bit more precise on what your looking for, and give a bit more info on your system specs, I will be able to assist you better.