I always fly with Bletchley's missions in my private campaigns in WOFF, as I used them in OFF already (plus his AA mod)

It's easy to install, you can always activate/deactivate only with a click in the workshop.

For the DID campaign, it could be up to each flyer to use them or not, they only bring more diversity, more historical context and a little work sometimes (like when you need to carry a telegraph device for artillery spotting, it asks you to lower your ammo to compensate for the extra weight.)
