Nerfing the sentry's to a fair stage is possible without much work (probaly). BLU has crits so it wouldn't take that much to destroy the sentry, and I could potentially increase all damage towards sentries by X%. Dispenser would just be broken I think, giving all around it ammo isn't a good mechanic for jailbreak, so in my opinion we'd have to disable it. Teleporters could be an interesting mechanic, needs testing I suppose.
This is what I could change about sentries easily without requiring any modification to plugins or the introduction of new plugins (probably):
- Always force mini-sentry regardless of wrench
- Reduce sentry damage
- Reduce sentry firing speed
- Reduce sentry radius
- Reduce sentry build rate