Well, as things are today we have:
- Everyone gets a single expertise-family feat at level 5 for free.
- No one can take an expertise feat before level 5.
The way this house rule is made we're going to keep discussing it every time WotC changes or adds a new rule/feat concerning expertise bonuses. Besides, we still (as written) get problems with those with multiple sources of attacks (implement, weapon, racial, etc).

I'll propose the following instead of what we already have:

"At levels 5, 15 & 25 L4W characters get a free +1/+2/+3 feat bonus to hit with all their attacks."

This way people are free to pick whatever feats they want, since they'll never stack. Seems like less bookkeeping for me.