You're probably going to have to find the pinouts for the Toshiba TIMM and create a 9-pin to 15-pin adapter for it. Shouldn't be too hard.
As for myself, I use my Jag with both my NEC Multisync 3D (15Khz and 31Khz) and Commodore 1084 monitors.
However, when I first got my Jag from a friend of mine at work, I had to open it up and hack it before I could even use it. It seems that while he had it in storage something slammed into the back of the unit and broke off the last four contacts of the AV port. I then removed the RF modulator unit and put in a 15-pin plug for a customized AV box I had constructed. Later, I decided to remove the 15-pin plug and replaced it with a PlayStation AV plug hacked from a PS Multi AV out box that Sony put out. This would make it easier to use off the shelf cables including an S-Video Monster Cable that I normally use in conjunction with my Mac.
For RGB use, I made my own box that contains a EL1883 sync separator chip (to get sync channels for RGB from Composite Video) and a Sony CXA1145 RGB chip (taken from a Sega Genesis) for amplification. I also made several custom cables to use with the box so I can use all of my other consoles.
The first picture, RGBBox.jpg, is my RGB box. It used to be a NAKI VGA box for the Sega Dreamcast. It has a section of a Xbox S-Video box grafted in the back for the purpose of holding the Audio and Video plugs. The light colored cable on the left is my Xbox RGB cable.
The second picture, MultiOut.jpg, is the Sony AV box where I got my AV plug from.
The third picture, AVport.jpg, shows the AV plug in my Jaguar. You can also see where I covered up the damaged Jaguar AV port. The Jag's AV port is where I got all of my signals from and soldered my wires directly to the contacts.