What about for fine tuning delays/choruses?There's really not a TON of use for a scope that would aid in pedal building.
If your goal is to learn more about scopes and/or electronics and audio signal science then I'd suggest reading enough to make an informed purchase because there are a dozen or so specs you'd want to be familiar with.Which ones will be more important will depend on theuse you have planned for it.
An entry-level scope is great for that kind of exploration and hands-on learning. Then when your ready for the next scope (assuming you still have an interest) you'll be better prepared to choose the one that fits your specific needs.