To make your own presets, adjust the sliders how you want under the Settings tab, then go to the Preset tab and there, there's a box with an arrow you can press that gives you the option to "Add the preset" (among some other options).
Also on editable presets, you can right-click on one of them to change it, apply it, or delete it.
For filters that you submit to the online library, your first 9 presets will be shown (rather than FF randomly creating variation images). But if the presets don't have "seemless tiling" on, the FF library will force it on for those library images.
In any case, yes, the option is there -- it's just a matter of finding it.