" I was really just wondering if cr-mo 4130 is generally considered to be good quality bike tubing "
In a sense possibly no. Since some people will interpret quality as referring to the degree of refinement or superiority of a particular product, where 4130 is the bottom of the barrel of lightweight tubing. But 4130 straight gage (particularly older tubing) is normally just some aircraft tubing, and as such is everything you could possibly want, in so far as quality control is concerned.
I actually think there are advantages to straight gage tubing for touring. First, for serious heavy duty touring bikes there is little reason to use anything much fancier than either 4130 straight gage or butted 4130 tubing (generic or branded) (no harm in anything fancier necessarily but little realizable improvement). So lets say you have a 24" tube with 4 inches of butt on either end. You would save 3 ounces in the butted tube. It is likely only two tubes that will be butted in the main triangle, A straight tube frame may be butted in the seat tube, or it may not same with a butted frame. So the overall difference in weight is 6-9 ounces. Every other part is untouched. Most tapered tubes (chainstays, seatstays, forks) are actually going to be the same, though there could be degree of refinement differences, but they will all be specialty bike tubes either way (or straight gage 4130), and they tend to be generic unless they are fairly fancy tubes the likes of which do not necessarily make it on even 4K bikes. But anyway, with straight gage we are just talking about a 6-9 oz difference. On a bike that may with gear weigh 100 pounds. As against that 6 ounces, there are advantages to the heavier stuff; it rides nice; it is stiff; it takes all the bobbles you could want to braze on; it adapts to more take down arrangements with full strength; less prone to damage during shipping; nice solid base for all the heavy water bottles; less prone to rust through...
When I build a personal frame with 4130 straight gage it actually doesn't save me any money. There is no cost difference in getting aircraft tubing, and ordering 4130 butted from Nova from where my tubing has to come to. So it is just a choice based on the sort of bike I want.
Also, if you hang out on the boards and hear big name people talking proudly about the bikes they make there can be a lot of either 4130 butted or straight gage that lands in the bikes of some fancy NAHBS winning types, for sure the last two years, and one of the earlier years also. Could be others, only know 3 of the years winners, by online rep.
I don't really feel comfortable on MTB geometry bikes for road use, but many do. They have some features of a touring bike, but not others. As long as you will be comfortable they are a good choice.