Summoner Spell Cross-interaction

What if summoner spells could be combined; cast simultaneously in order to produce an empowered result at the cost of extended cooldown? Say, for example, + produces an ignite at twice the range. or + produces the old exhaust effect, which includes makes a target more vulnerable to incoming damage. It gets interesting to explore possibilities. Perhaps + allows the movement speed boost of an ally, or + allows the ignite of any enemy within range of a valid teleport location.