As we know, the current RO version's engines can only have limited chance to ignitor and can't be relaoded. But the mod called "Engine Ignitor" which originally made by @HoneyFox allows you to relaod the engine with something like "hypergolic fluid". The mod is now managed by @DennyTX
The mod is here.[1.2] Engine Ignitor continued. (23 oct 2016)
Can RO support this mod? Then I can build the rocket like Falcon9 that can ignitor the second times to make itself reuseable. That will be great.