I think you could have added a lot of the summoning, animating, conjuring, etc. which have long durations in D&D 3.5 and earlier editions (some emerged towards the end of 4th Edition, such as summoning gargoyles or creating scarecrows, but they should have done it earlier). Basically, any spell who has a duration of 10 minutes or longer usually fits quite well as a ritual. Even spells such as charm person and invisibility could with some modification have fitted as a ritual, but then as a means to get past guards or into castles (more roleplaying focus, vs. combat focus). If any battle happens (character loose focus/concentration, i.e. takes a standard action) the ritual immediately ends and the player have a surprise round.
I am actually not that familiar with 3e, are you using Character Builder or interested in having your compendium be an expansion for it.
this is what the XML for a ritual or practice looks like.
<RulesElement name="Forge Weapon" type="Ritual" internal-id="ID_FMP_RITUAL_308" source="Martial Power III" revision-date="8/27/2017 12:37:50 PM" >
<Flavor> While a great deal of magic is invested in an item as it is forged, the users own magic and that of its enemies may truly make it complete. </Flavor>
<specific name="Category"> Creation </specific>
<specific name="Key Skill"> Athletics (no check) </specific>
<specific name="Component Cost"> Special </specific>
<specific name="Duration"> Permanent </specific>
<specific name="Level"> 4 </specific>
<specific name="Time"> 1 hour </specific>
<specific name="Market Price"> 50 gp </specific>
<specific name="Prerequisite" />
<specific name="type"> Martial Practice </specific>
You can create magic weaponry or armor or actually just about any tool of war. Your level determines the level the magic item can have . The component cost is equal to the price of the magic item which you forge although additional effect price beyond the original bonus quality generally require a bit more (and may be paid in the coin of charity). The war tools can be seeded in such a way as to leave them open to gaining additional more magical empowerment often featuring a quest involving the slaying of magical beast ... in some cases usage over time will gradually enhance these opened items (see weapon gifts).
</RulesElement>