Thanks both for the honest feedback — exactly what I was hoping for.
@pkenewell — appreciate the link, I'm aware of Lee Mac's MPLine and have a lot of respect for his work. His implementation is elegant and handles the core offset drawing well. MultiPLine goes in a different direction: DCL-based configuration dialog, per-line layer assignment, named presets that persist across drawings, and the Pro version adds a command reactor for auto-sync. Different scope rather than a direct replacement for what he built. Worth knowing about either way so thanks for flagging it.
@BIGAL — fair points across the board. BricsCAD: honestly didn't design for it and can't make promises there. The reactor implementation in Pro leans on AutoCAD-specific VLR functions. Lite might load fine in BricsCAD but I haven't tested it — if any BricsCAD users try it I'd be curious to hear the result. On the "why pay" question: fair challenge. The free Lite version covers the core workflow for most users. The Pro is aimed at teams and daily-driver users who want auto-sync and a preset library they can share across a team. Whether that's worth $29 is genuinely up to the buyer — I'm not trying to oversell it. The package suggestion is actually something I've been thinking about. MultiPLine is my first commercial release but I have other tools in progress. A bundle makes more sense as a value proposition and I'll keep that in mind for when there's more to package together.
One more thing — I've added the full .lsp source to the Lite download on Gumroad. Free to inspect, modify for personal use, and learn from.
Thanks again for taking the time — this kind of feedback from experienced users is more useful than any marketing.
Zlatislav