The ANSI-Wide layout puts the apostrophe within comfortable distance, not sure what you're saying? Wide is very comfy. But the hyphen-minus is badly placed either way.

For Enter I recommend using Extend – I mainly use Ext+Space for Enter. With Extend and/or AltGr it's also quite simple to add for instance the hyphen-minus somewhere comfortable. Layers are nice! Using CapsLock as the Extend modifier may be problematic for you if your pinkies are weak, but maybe it's mostly your right pinky you're having trouble with? I find it very comfortable. If you don't, there's always the option of using a thumb Extend key like SteveP every so heartily recommends. ^_^

Using Extend with EPKL (formerly PKL) on Windows one can add macro-like strings like "type <p></p> then four left arrows placing your cursor between them". In EPKL there are sample mappings in the coding/strings Extend layers.

AltGr works best with the Wide mod though, just saying. ;-)

Looks like what you've got there is half of Extend. The left space bar makes for a good Extend/Fn key, but if I were you I would definitely be looking to implement a full Extend like DreymaR's. You'd still get your important functions like copy and paste, but don't underestimate the power of home-row modifiers!

That keyboard looks pretty good, and it being programmable makes it a particularly good choice. My one criticism would be, even though the space bar is split, they have kept it inordinately large - compare with the Matias Ergo Pro which I have, although it's sadly not programmable, it does have the best bottom row (space, alts) I've seen on a keyboard.

I have two separate extra layers: A "programmer/symbol" layer for characters, and an Extend layer for functions and navigation.