TL;DR
Add an "enable all optional dependencies" button.What ?
Right now if you have a mod with lots of optional dependencies and you want to enable all or at least most of them there is no quick way to do it. The easiest way is to click on the small arrow in front of the mod in the dependency list. You will jump to that mod (either in the "manage" or "install" tab, dependent on whether you have that mod installed already). from there you can enable the mod. There is no easy way going back however. In the worst case you have to change the tab, then either scroll through hundreds of mods or use the search function, then select the mod, then scroll down the dependency list and you can select the next optional dependency. Doing this over and over for 5 to 20 times is no fun. Remembering all the optional dependencies is not feasible any more at some point and having to write the mod list down or taking a screenshot is just annoying.A button "enable all optional dependencies" or even better a checkbox in front of every optional dependent mod would be very convenient.