I'm not sure I 'got' your question--is it for when you have to bake several things--one calls for 350, one for 400 and maybe one for 375?
Look, oven temps aren't really that critical. You can almost always use a little higher or little lower temp, and just adjust the cooking time (I've even baked cakes and bread on my gas grill, where the temp is not that easily regulated). Basically, look at the recipes, and think it through. Either use 350--which is a good all-purpose temp, or pick the temp called for in the recipe that needs to be the most exact (if you're roasting meat and baking a cake--the cake temp would be the one I'd pick to use).
Ovens often vary as much as 25-50 degrees anyway. And think about it--our grandmothers and great grandmothers managed to bake cakes and biscuits and feed their families using wood stoves and ranges that didn't have very accurate ovens. Really, if you take a deep breath, look at the recipes, and think about it (if you use a lower temp, you'll need to bake a bit longer), you'll be just fine. Just keep an eye on things and take them out when they get done.