Can you post some sample code to better illustrate the issue?

As for the alpha branch I'm not sure I'll need one since I'm not really planning to add any big new features in the near future unless you have anything to propose.

I too was facing similar issue where I wanted to pause ObservableArray using watch API but it doesnt work.
To make it work, I made the following changes in knockout.reactor.js (Version 1.3.6)

Solution: Check watchable condition even for array change events in 'assignWatcher' API

/************** code snippet **************/ API: assignWatcher
child.subscribe(function (changes) {
if (child.watchable !== false) {
ko.utils.arrayForEach(changes, function (item) {
var returnValue = evaluatorCallback.call(context, parents, child, item);
if (returnValue !== undefined) context(returnValue);

                        if (!item.moved) {
                            // Deleted or brand new item. Unwatch or watch it accordingly.
                            setTimeout(function () {
                                watchChildren(item.value, (keepOffParentList ? null : child), parents, item.status === 'deleted');
                            }, 0);
                        }
                    });
                }
            }, undefined, 'arrayChange')._watcher = context;

/********************************************/

Ok, thanks for the update @kailashsingh . I'll make the necessary changes when time permits.