Don't expect that to be changed for OpenWrt. The relevant regulatory bodies insist that the maximum values are obeyed and not user-changeable (yes, even allowing users to select their country is already frowned upon and not accepted for new devices seeking certification), so widening the permissible options beyond the minimum that's always possible is a very slippery slope. But there is another issue, doing this would essentially neuter the values from wireless-regdb and force OpenWrt to become the final arbiter to decide what limits are permissible and which aren't, for every country of the world, that's not likely to happen - you want this to be done via wireless-regdb. Why can Cisco do that, because they have the staff and business incentive to so do for the regions they're selling to - OpenWrt can't (wireless-regdb tries to do this, for everyone in the linux ecosystem (and beyond)).
We already -regularly- have users who are looking for the most permissible countries around to game the system - OpenWrt really can't make that any easier. Lawsuit- and project closure in 3-2-1-gone.
Would there be reasons to structurally overhaul wireless-regdb, maybe - but that's not going to happen via OpenWrt, that's something you need to discuss upstream (linux-wireless@v.k.o/ mainline); desire for this exists, but it's a major can of worms.
Accordingly I do not think anyone will attend https://github.com/openwrt/openwrt/issues/15032 according to your intentions, it's something that needs to be solved mainline, via the linux-wireless developers.
Disclaimer: I'm not an OpenWrt developer and can't speak for the project, the above is just my own interpretation of the situation and personal opinion.