Yes, this is the OG ToggleSneak that you used back in 1.7.10. Supports toggling sneak, sprint and fly boosting. For some reason, the mod has been abandoned for quite a long time so I decided to pick it up.
This is a straight port of the original ToggleSneak. The controls would be identical to the one from 1.7.10, meaning controls between holding and toggling are seamless, no more getting stuck between toggling when you just want to hold sneak.
Note: Fly boosting only works in creative mode and maybe bannable by anti-cheat plugins.
Note: Toggle sneak may be considered bannable. Please refer to their server rules. You can disable this feature in the options.
The author will not be held responsible if your account is banned from a server because you did not follow the rules.
Currently updated for 1.12.2 only. May consider updating to 1.14.4 if demand is high.
Screenshot (You can see it's Minecraft 1.12 because of terracotta blocks):
If this says "Project cannot be found", blame this forum. The widget needs to be fixed.